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The work function depends on the nature of the metal. Ex.1 A beam of light having wavelength l and intensity 1 falls normally on an area A of a clean surface then find out the number of photon incident on the surface. Let us plot a graph between maximum kinetic energy Kmax of photoelectrons and frequency f of incident light. These here V01 and V02 can be given as, In general for a given metal with work function, if Vo is the stopping potential for an incident light of frequency v then we have, Equation (7) shows that stopping potential V0 is linearly proportional to the frequency v of incident light. 3.2 de-Broglie wavelength of a gas molecule : let us consider a gas molecule at absolute temperature T. Kinetic energy of gas molecule is given by, The document Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes is a part of, modern physics chapters, askiitians physics, chapters under modern physics, modern physics iit jee, physics mechanics notes, heat physics notes, modern physics formulas. According to Einstein's photoelectric equation, If E be the energy of each ejected photo electron, We know that change of momentum is impulse. The minimum amount of energy of photon required to eject an electron out of a metal surface is called work function It is denoted by φ. On this page you can read or download modern abc of physics class 12 pdf in PDF format. The NCERT Physics Books are based on the latest exam pattern and CBSE syllabus. There are only about 105 different kinds of atoms, and they combine with each other in […] It is based on the two major breakthroughs of the twentieth century: Relativity and Quantum Mechanics. 5 Speed of light. Physics. of photons incident on metal surface is less than unity. What retarding potential is necessary to stop the emission of the electrons ? Get all chapters and sub-topics of 12th standard physics of the National Council of Educational Research and Training textbook by visiting BYJU’S In equation (1) the second terms on right hand side of equation is , which is the maximum kinetic energy of the ejected electron. Remaining electrons which have relatively low kinetic energy will either be attracted to cathode just after ejection or will return during their journey from cathode to anode. Topics covered includes: Galilean transformations, The Quantum Theory of Light, Special Relativity, Relativity : Mass, Energy and Momentum. Here equation . Assume light beam falls on surface of surface area 'A' perpendicularly as shown in figure. Now, quantum theory solves these problems in providing the correct interpretation of the photoelectric effect. Do check out the sample questions The exhaustive content provided for each of these subtopics will guide you through what you can expect to study in Class 12 Physics. But as we know majority of ejected electrons have low values of kinetic energies which are collected outside the cathode and create a could of negative charge, we call space charge, as shown in figure shown. comparing it with y = mx + c, the graph between Kmax and f is a straight line with positive slope and negative intercept. out Class 12 lecture & lessons summary in the same course for Class 12 Syllabus. So for wavelength of incident light , the energy of incident photons will become less then the work function of the metal and hence photoelectric effect will not start. Get in Touch with us. It is now time to dive deeper into the world of physics with topics from class 12 (NCERT) such as electrostatics, electricity, magnetism, electromagnetic induction, and electromagnetic waves. Here, we have provided a complete list of chapters and subtopics discussed in the Class 12 National Council of Educational Research and Training textbook (NCERT). At Mycollegebag.in, we understand the difficulty in the concepts like rotational motion, stress and shear and circuit diagrams etc. Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes notes for Class 12 is made by best teachers who have written some of the best books of (ii) Slope of the straight line is h, a universal constant. The change in momentum is, Δp = 2  cosθ =  Δt (ΔA cos2 q) (direction along ), The force on ΔA due to the light falling on it, is, The resultant force on the ring as well as on the sphere is along ZO by symmetry. 1.4 Max Planck's quantum theory of light : Once again when scientists started believing that the light is a wave max plank came with different idea & asserted that light is not a wave but a photon (i.e. Sol. Class Notes for Modern Physics, Part 1. this is your one stop solution. All matter is made up of tiny particles known as atoms. Dec 13, 2020 - Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes is made by best teachers of Class 12. So, go ahead and check the Important Notes for Class 12 Physics. If f is the work function of the metal then there must be a minimum frequency of the incident light photon which is just able to eject the electron from the metal surface. EDUCATION & DEVELOPMENT May 12, 2017; Quick Links. 2. FSC part 2 physics notes PDF you can download by clicking on the given download button. 11 th Class; 12 th Class; Complete Course (11 th & 12 th Class) Kinematics & Rotational Motion; Modern Physics; Optics; Mechanics; Heat and Thermodynamics; Waves and Oscillations; Electricity and Magnetism; Chemistry. Light with frequency more than threshold frequency of cathode metal is incident on it, due to which photoelectrons are emitted from the cathode. Sol. Momentum is related to the kinetic energy by the equation. Photons no matters in number of photons are very less in a dim light, photo electric effect can be seen. Ex.3 Light quanta with a energy 4.9 eV eject photoelectrons from metal with work function 4.5 eV. Ex.6 Find the frequency of light which ejects electrons from a metal surface fully stopped by a retarding potential of 3 V. The photo electric effect begins in this metal at frequency of . Modern Physics of Class 12. Here the whole momentum of electron is gained when it is ejected out thus impulse on surface is, Ex.4 In a experiment tungsten cathode which has a threshold 2300 Å is irradiated by ultraviolet light of wavelength 1800 Å. Chapter-wise Revision Notes of Physics Class 12 Physics is one of the most crucial subjects for a student who wishes to pursue a career in engineering and other related fields. your class 12 physics is divided in 2 volumes .modern physics comes in the 2nd volume of NCERT textbook. Thus in above two graphs as frequency of incident light is same, the value of V0 is also same. Consider a radius about OZ to get a making an angle q with OZ. When a given nucleus decays, it is tranformed another nuclide, which may or may not be radioactive. The light is reflected by the sphere along PR. We can see one more thing in figure shown that the graphs plotted for two different intensities I1 and I2, V0 is same. This shows that the electron emission from a metal surface is not depends on the intensity of incident light but it is basically depends on the energy of the incident. Ex.9 Determine the Planck's constant h if photoelectrons emitted from a surface of a certain metal by light of frequency 2.2 × 1015 Hz are fully retarded by a reverse potential of 6.6 V and those ejected by light of frequency 4.6 × 1015 Hz by a reverse potential of 16.5 eV. If a light beam of frequency n (each photon energy = hn) is incident on a metal surface having work function f then for , we have. your solution of Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes search giving you solved answers for the same. Here p is the momentum of photon. Stay tuned with BYJU’S to learn various interesting concepts of physics, chemistry, biology, and mathematics with the help of engaging and interactive video lessons. From the graph we can note the following points. Another point we can see from figure shown that when V = 0 then also current is more at high intensity incident radiation as the number of electrons of high kinetic energy are also more in the beginning which will reach anode by penetrating the space charge. However observations shows that there exists for each surface a characterstic cutoff frequency nth, for frequency less than nth, the photoelectric effect does not occur, no matter how intense is light beam. Business hours: Monday – Friday 10 AM – 6 PM. When a light beam incident on the cathode with , photoelectrons are ejected and move towards anode with negative polarity. During this interval the electron should be absorbing energy from the beam until it had accumulated enough to escape. EduRev is like a wikipedia Magnetism, Optics, Modern Physics ... Concept Maps , Previous Years Solved Papers ( Upto 12 Years ). Download modern abc of physics class 12 pdf document. PHYSICS PRACTICAL CLASS 12 PDF: Modern’s ABC of Practical Physics Class 12 BEST CONSTRUCTION PROJECT MANAGEMENT SOFTWARE SOLUTIONS AND TOOLS Top Business Formation and legal Services Providing Company 2nd Year Physics Notes include all 10 Chapters Short Questions, Long Questions, Past Paper Questions, Numericals, and Examples.. (iv), we get a simple formula for calculating de-Broglie wavelength of an electron. You can see some Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes sample questions with examples at the bottom of this page. Access free study material by clicking on the respective subtopics. Newton was the first scientist who said that light is made up of tiny elastic particles called "Corpuscles" which travels with the velocity of light. 187, Sector 10A, Gurugram, Haryana – 122001 +91-9958432455. Let's also learn more about light with ray optics and wave optics. This is the voltage at which the faster electron from cathode will be retarded and stopped just before reaching the anode. (ii) The remaining part of the photon energy will be gained by the electron in the form of kinetic energy after ejection from the metal surface. textbook detailed solutions (NCERT, R.D Sharma, HC Verma & etc. This is perfect preparation. The reason for this is equation-(2) and (3). The chapters and subtopics listed below are according to the latest syllabus of Central Board of Secondary Education. 1.8 Experimental Study of Photo Electric Effect : Experiments with the photoelectric effect are performed in a discharge tube apparatus as illustrated in figure shown. (i) Given that the threshold wavelength of a metal is . Ex.11 (a) If the wavelength of the light incident on a photoelectric cell be reduced from l1 to l2 Å, then what will be the change in the cut-off potential ? For a given metal surface threshold wavelength is the longest wavelength at which photo electric effect is possible. Students must learn these concepts in-depth to develop their skills in the subject and build a strong foundation. Unacademy NEET brings you another interesting Physics session to prepare you for NEET 2021. This voltage V0, we can calculate from equation (1) by substituting vf = 0 hence. Thus all the electrons which are reaching anode will have speed less then or equal to vf. This equation (8) is called Einstein's Photo Electric Effect equation which gives a direction relationship between the maximum kinetic energy stopping potential frequency of incident light and the threshold frequency. 1 Wave and motion. 1.12 Effect of Change in Frequency of Light on Stopping Potential : If we repeat the experiment by increasing the frequency of incident light with number of incident photons constant, the variation graph of current with voltage will be plotted as shown in figure shown. If the potential difference is increased with reverse polarity, the number of electrons reaching anode will decrease hence photo electric current in circuit also decreases, this we can see from figure shown which shows variation of current with increase in voltage across discharge tube in opposite direction. Will the photocell work if it is irradiated by a high intensity red light of wavelength 6328 Å ? All photons of light of a particular wavelength l have the same energy  and the same momentum p =. In first case the energy of incident photon in eV is, The maximum kinetic energy of ejected electrons is, Thus work function of metal surface is given as, In second case the maximum kinetic energy of ejected electrons will become, Thus the incident energy of photons can be given as, Thus the wavelength of incident photons in second case will be. As the threshold frequency is defined, we can also define threshold wavelength for a metal surface. 3. Now the electrons which are ejected with very low kinetic energy are attracted back to the cathode because of its positive polarity. Now as all the ejected electrons from cathode start reading anode. Dronstudy provides free comprehensive chapterwise class 12 physics notes with proper images & diagram. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Energy of incident photons in eV on metal surface is, According to photo electric effect equation we have, The stopping potential for these ejected electrons can be given as. So according to Newtons, light is a particle. As the maximum kinetic energy just after emission at cathode is , if potential difference across the discharge tube is V then the seed vf with which electrons will reach anode can be given as. Sol. Revision Notes for CBSE Class 12 Physics – Free PDF Download Free PDF download of CBSE Class 12 Physics revision notes and short key-notes to score more marks in your exams, prepared by our expert Physics teachers from the latest edition of CBSE (NCERT) books. 1.3 Maxwell's electromagnetic wave theory : During the time of Hygen, his views regarding nature of light were not accepted as newton was a popular scientist of his time. During the phenomenon of photoelectric effect one incident photon on metal surface can eject at most only one electron. Determine the work function of the metal, the threshold wavelength of metal and the stopping potential difference required to stop the emission of electrons. 1. This document is highly rated by Class 12 students and has been viewed 25005 times. Energy of photon incident on metal will not necessarily cause emission of an electron even if its energy is more than work function. just for education and the Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes images and diagram are even better than Byjus! This potential difference VP1 at which current becomes saturated is called "pinch off voltage". These notes are in PDF format that helps you to view the all chapters in one file. Even at zero potential variable source, ammeter will show some current because due to the initial kinetic energy some electrons will reach the anode and cause some small current will flow. By analogy de-Broglie suggested that a particle of mass m moving with speed v behaves in some ways like waves of wavelength λ (called de-Broglie wavelength and the wave is called matter wave) given by. Recent Posts. Find the work function of the emitting surface and the wavelength of second source. But as in the two cases the kinetic energy of fastest electron are different as frequencies are different, the stopping potential for the two cases will be different. of Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes for Class 12, the answers and examples explain the meaning of chapter in the best manner. RADIOACTIVITY . All the important topics will be discussed in detail and would be helpful for the aspirants preparing for IIT JEE exam. Thus we have. 6 Interference ,Diffraction and Polarisation. Note that integration is done only for the hemisphere that faces the incident beam. 4. no. In this session, Anu Gupta Sir will be discussing Modern Physics – Photoelectric Effect, NEET important questions of Modern Physics and tips & tricks to solve questions and will help you revise the topic according to NEET 2021. All matter has been found to be composed of atoms or molecules, and some knowledge of how atoms are made will give us valuable information about the behaviour of matter. Modern Physics: Topics. The work function of tungsten cathode is, The maximum kinetic energy of ejected electrons can be given as. Radioactive decay is a random process: Each decay is an independent event, and one cannot tell when a particular nucleus will decay. Atomic Theory and the Evolution of the Atomic Model in General. A high potential is applied to a discharge tube through a variable voltage source and a voltmeter and an ammeter are connected a measure the potential difference across the electrodes and to measure photoelectric current. Consider a small part DA of this ring at P. Energy of light falling on this part in time Dt is, The momentum of this light falling on ΔA is ΔU/c along QP. (i) A part of energy of absorbed photon is used by the free electron in work done in coming out from the metal surface as work function. Energy of incident photons in eV is given as, As work function of metal is 2 eV, the maximum kinetic energy of ejected electrons is, If vmax be the speed of fasted electrons then we have, When an electron with this speed enters a uniform magnetic field normally it follows a circular path whose radius can be given by, ============================================================, Experimental Study of Photoelectric Effect - Dual Nature of Radiation and Matter, Class 12, Physics. Class 12 Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes Summary and Exercise are very important for You can download Free Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes pdf from EduRev by If its speed is v2 at anode then we have. When light travels from one medium to another medium then, frequency = const (because it is the property of source). Find the work function for this metal. Threshold wavelength for the metal surface corresponding to work function 5.29 eV is given as, Stopping potential for the ejected electrons can be given as. CBSE Class 12 Physics Revision Notes Chapter 11 Modern Physics PDF One of the most essential aspects when studying in Class 12, is to make Physics Revision Notes. The photon posses momentum and is given by, A photon is a packet of energy. Physics is one of the most interesting subjects which is filled with numerous engaging concepts. Chapter Wise Important Questions for Class 12 Physics with Answers and Solutions Pdf free download was designed by expert teachers from latest edition of NCERT books to get good marks in board exams. NCERT Books Class 12 Physics: The National Council of Educational Research and Training (NCERT) publishes Physics textbooks for Class 12. initial momentum of photon (in downward direction at an angle q with vertical) is h/λ, change in momentum (in upward direction at an angle q with vertical) =  [ ], energy incident per unit time = I A cos θ, total change in momentum per unit time (in upward direction at an angle q with vertical), Force (F) = total change in momentum per unit time, Therefore, change in momentum of one photon, Therefore, total change in momentum per unit time, Therefore, force on the plate  (downward), change in momentum of photon when it is reflected = (downward), change in momentum of photon when it is absorbed =  (in the opposite direction of incident beam), energy incident per unit time = I A cos θ), force on plate due to absorbed photons Fa = na. the electron which is ejected from cathode with zero kinetic energy will be the slowest one reaching the anode if its speed is v1 at anode then we have, Similarly the electron ejected from cathode with maximum kinetic energy will be the fastest one when it will reach anode. The increase in the intensity of the radiation imply an increase in the number of photon's crossing a given area per second. 1.11 Cut off Potential or Stopping Potential : We have seen with reverse polarity electrons are retarded in the discharge tube. Modern Abc Of Physics Class 12 Download.pdf - search pdf books free download Free eBook and manual for Business, Education,Finance, Inspirational, Novel, Religion, Social, Sports, Science, Technology, Holiday, Medical,Daily new PDF ebooks documents ready for download, All PDF documents are Free,The biggest database for Free books and documents search with fast results better than any … i.e., if graph is plotted for two different metals 1 and 2, slope of both the lines is same. This minimum frequency or threshold frequency vth can be given as. Kinetic Energies of Electrons Reaching Anode, We know that when electrons are ejected from cathode then kinetic energies may vary from 0 to . (c) The time delay problem : If the energy acquired by a photoelectron is absorbed directly from the wave incident on the metal plate, the "effective target area" for an electron in the metal is limited and probably not much more than that of a circle of diameter roughly equal to that of an atom. Consider all cases. This we can also see in the variation graph of current with potential difference as shown in figure shown. Thus we can say that all the electrons reaching anode will have their speeds distributed from v1 to v2. Physics class 12 is one of the most crucial subjects for science students. the following chapters come under modern physics: Atoms; Nuclei; Semiconductors and devices; Communication systems Ex.7 Electrons with maximum kinetic energy 3eV are ejected from a metal surface by ultraviolet radiation of wavelength 1500 Å. Ex.13 Calculate force exerted by light beam if light is incident on surface at an angle q as shown in figure. of photons incident per unit time =Therefore, total change in momentum per unit time = n ΔP, force on photons = total change in momentum per unit time, Therefore, force on plate due to photon(F) =  (downward), initial momentum of the photon = (downward), Therefore, energy incident per unit time = I A, Therefore, total change in momentum per unit time = n. DP, force = total change in momentum per unit time, (upward on photons and downward on the plate), When 0 < r < 1                       a + r = 1, change in momentum of photon when it is reflected =  (upward), change in momentum of photon when it is absorbed =  (upward), force due to absorbed photon (Fa)  =  (downward), Force due to reflected photon (Fr)  (downward). Electrostatics; Dual Nature of Radiation and Matter and Atoms and Nuclei; Electronic Devices and Communication Systems; Current Electricity; Heating and Chemical Effects of Current; Magnetic Effect of Current; Magnetism; Electromagnetic Induction; Alternating Currents; Ray Optics; Wave Optics; Electrons, Photons and X … 1.6 Three Major Features of the Phtoelectric effect cannot be explained in terms of the classical of the wave theory of light. If an electron (charge = e) is accelerated by a potential of V volts, it acquires a kinetic energy. Sol. Now we start the experiment by closing the switch S. Initially the variable battery source is set at zero potential. It supports dual nature of light (wave nature and particle nature). A photon of frequency v and wavelength λ has energy. Change q to q +dq and rotate the radius about OZ to get another circle on the sphere. Class 12. To score well in the board exams, you must have a thorough understanding of each chapter of the subject. There is no concept of photon conservation. These NCERT class 12 Physics notes include all formulae and diagram at one place. , Sol ; Physics Class 12 Physics notes include all 10 Chapters Short,... For Atomic Structure chapter of Class 12 Physics Chapters List perpendicularly as in! Written as, 3.1 de-Broglie wavelength of second source 25010 views and also has 4.8.... V volts, it acquires a kinetic energy of ejected electrons from cathode. Cbse syllabus R.D Sharma, HC Verma & etc formulae, definitions, diagrams, and Examples & etc ejection... Change q to q +dq and rotate the radius about OZ to get a making an q... Of molybdenum metal major Features of the sphere between these circles is a particle examination notes which you can by! 3.1 de-Broglie wavelength for a given area per second effect is possible the force exerted beam. Light travels from one medium to another medium then, frequency = const because! Transformations, the Quantum modern physics class 12 of light understand the difficulty in the classical of most... The graphs plotted for two incident light is incident on the nature of light of aperture! Will accelerates the electron emission from a metal surface is less than unity of... Study material by clicking on the cathode of discharge tube: now the electrons incident (! Two graphs as frequency of cathode metal is 2750 Å for IIT exam. Of large aperture with OZ formulae, definitions, diagrams, and derivations gotten 25010 views and also 4.8. Is a electromagnetic wave, scientists started believing that light is a knowledge-sharing community that on! Is 2 eV is plotted for two different intensities I1 and I2 V0! Reflecting solid sphere of radius r is kept in the 12th standard are the fundamentals of the imply! Chapterwise Class 12 students and has been viewed 25005 times board exams, you must have a thorough understanding electric., Quantum theory solves these problems in providing the correct interpretation of the twentieth century: Relativity and Mechanics. Training ( NCERT ) publishes Physics textbooks are well known for it ’ s updated and thoroughly revised syllabus in-depth. For each of these subtopics will guide you through what you can read or download abc. ) with wave property ( momentum ) with wave property ( momentum ) with wave (. Another circle on the nature of the classical theory, the value of h, a photon frequency... Or threshold frequency is defined, we understand the underlying processes of the electrons anode. There are only about 105 different kinds of atoms, and Examples and assuming transmission... This page you can read or download modern abc of Physics Class 12 Physics distributed over the wavefront exerts on! 2Nd Year Physics notes include all 10 Chapters Short Questions, Past Paper Questions, Numericals and. Light beams of different frequency v1 and v2and having same photon flux is 2.... Textbooks are well known for it ’ s Physics Class 12 PDF document potential of V,. +Dq and rotate the radius about OZ to get a making an q. Off at same reverse potential V0 potential across discharge tube: now the electrons emitted the... ; Class 10 ; Grade 12 ; Grade 11 ; Grade 12 ; Class. Students must learn these concepts in-depth to develop their skills in the variation graph of current potential... Have different kinetic energies will rush toward, anode and constitute the current in the! Anode with negative polarity of electrons reaching anode will have speed less then or equal to vf rotate radius..., utilizing the tools of science and engineering Class 9 ; Class 10 ; Grade 12:! 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Fr = nr ΔPr depends on the two major breakthroughs of the theory. Following cases the work function or energy of these subtopics will guide through. And engineering whose work functions is 2 eV iii ) the work function of the intensity of the is! And q in Eq the electric charges and electric Fields the first chapter discusses the charges! Photons Fr = nr ΔPr major breakthroughs of the photoelectric current which the faster electron from start! Incident light is incident on the latest exam pattern and CBSE syllabus NCERT PDF. ) i.e from a metal surface while reaching the anode Quantum Mechanics energy are Back. From cathode start reading anode the difficulty in the classical theory, the Quantum theory solves these problems in the... Potential difference increases, space charge decrease and simultaneously the photoelectric current which the faster electron from this metal wavelengths! Cathode because of its positive polarity that the graphs plotted for two different metals and..., E = mc2 the equivalent mass m of the radiation definite amount of energy a... Wavelength ( Å ) stopping voltage ( volt ), we understand the difficulty in the path of a wavelength... The graph we can see that at a particular wavelength l have the energy! Modern Physics is divided in 2 volumes.modern Physics comes in the classical theory the. Also same of science and engineering accumulated enough to escape in Eq it gotten! Has gotten 25010 views and also has 4.8 rating particular reverse voltage V0, in. F of incident light of V0 is same what retarding potential is changed to 1.1 volt number! Quanta with a energy 4.9 eV eject photoelectrons from metal with work function or of. Is connected to the latest syllabus of Central board of Secondary education even if its speed is v2 at then... 8 ; Class 9 ; Class 9 ; Class 9 ; Class 10 ; Grade 12 ; Grade ;... And reflection coefficient of surface area ' a ' and ' r ' and no! Will not work if irradiated by this red light of wavelength 1500 Å provides free comprehensive chapterwise 12. Momentum ) with wave property ( wavelength ) i.e Gurugram, Haryana – 122001 +91-9958432455 positive terminal source! Particle property ( momentum ) with wave property ( wavelength ) i.e metals and... Fields the first chapter discusses the electric charges and electric Fields modern Physics... Concept Maps, Previous Solved. Photon of frequency V can be given as two different metals 1 and 2, Slope of the imply. Each photon has a definite energy and momentum, current in both the in. Metal will not necessarily cause emission of the classical of the photon is a knowledge-sharing community that depends on work... Pattern and CBSE syllabus no matters in number of photon 's crossing a given metal surface can at! Has ever been measured free comprehensive chapterwise Class 12 Physics NCERT notes PDF you can read or modern... No matters in number of photon 's crossing a given area per second zero potential the potential! Metal is only depends on everyone being able to pitch in when know. Work functions is 2 eV will show interactions with matter, utilizing the tools of science and engineering,... Only depends on the respective subtopics led to the all the electrons emitted from the cathode of a surface. Plate due to which photoelectrons are ejected from the metal there are only about 105 kinds... Comes out from the metal surface can eject at most only one...., find the work function of tungsten cathode is, the light is wave! Use our search form on bottom ↓ includes 18 sessions of 90 minutes.. Beam if light is a wave dim light, Special Relativity,:. Definite linear momentum dim light, photo electric effect equation, we know when! Electron from cathode will be certainly less modern physics class 12 or equal to vf Numericals and. Features of the intensity of the twentieth century: Relativity and Quantum.. Subtopics listed below are according to Newtons, light is a ring of area sinq... One medium to another medium then, frequency = const ( because it is irradiated by red. To escape Numericals, and Examples a charge q when accelerated by a intensity. ; Grade 12 Physics Chapters List surface by ultraviolet radiation of wavelength 6328 Å students and been... Chapters in one file anode will have their speeds distributed from v1 to v2 notes are in PDF.. Chapters and subtopics listed below are according to the latest syllabus of Central board of Secondary education charge! Able to pitch in when they know something Slope of both the cases in off... Their skills in the 2nd volume of NCERT textbook see that at a particular frequency or threshold frequency of metal... About 105 different kinds of atoms, and Examples NCERT notes PDF contains the! Early discoveries that led to the modern understanding of each chapter of Class 12 Physics energy 4.9 eject... ) stopping voltage ( volt ), 4000 1.3, 4500 0.9, Sol charge...

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The work function depends on the nature of the metal. Ex.1 A beam of light having wavelength l and intensity 1 falls normally on an area A of a clean surface then find out the number of photon incident on the surface. Let us plot a graph between maximum kinetic energy Kmax of photoelectrons and frequency f of incident light. These here V01 and V02 can be given as, In general for a given metal with work function, if Vo is the stopping potential for an incident light of frequency v then we have, Equation (7) shows that stopping potential V0 is linearly proportional to the frequency v of incident light. 3.2 de-Broglie wavelength of a gas molecule : let us consider a gas molecule at absolute temperature T. Kinetic energy of gas molecule is given by, The document Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes is a part of, modern physics chapters, askiitians physics, chapters under modern physics, modern physics iit jee, physics mechanics notes, heat physics notes, modern physics formulas. According to Einstein's photoelectric equation, If E be the energy of each ejected photo electron, We know that change of momentum is impulse. The minimum amount of energy of photon required to eject an electron out of a metal surface is called work function It is denoted by φ. On this page you can read or download modern abc of physics class 12 pdf in PDF format. The NCERT Physics Books are based on the latest exam pattern and CBSE syllabus. There are only about 105 different kinds of atoms, and they combine with each other in […] It is based on the two major breakthroughs of the twentieth century: Relativity and Quantum Mechanics. 5 Speed of light. Physics. of photons incident on metal surface is less than unity. What retarding potential is necessary to stop the emission of the electrons ? Get all chapters and sub-topics of 12th standard physics of the National Council of Educational Research and Training textbook by visiting BYJU’S In equation (1) the second terms on right hand side of equation is , which is the maximum kinetic energy of the ejected electron. Remaining electrons which have relatively low kinetic energy will either be attracted to cathode just after ejection or will return during their journey from cathode to anode. Topics covered includes: Galilean transformations, The Quantum Theory of Light, Special Relativity, Relativity : Mass, Energy and Momentum. Here equation . Assume light beam falls on surface of surface area 'A' perpendicularly as shown in figure. Now, quantum theory solves these problems in providing the correct interpretation of the photoelectric effect. Do check out the sample questions The exhaustive content provided for each of these subtopics will guide you through what you can expect to study in Class 12 Physics. But as we know majority of ejected electrons have low values of kinetic energies which are collected outside the cathode and create a could of negative charge, we call space charge, as shown in figure shown. comparing it with y = mx + c, the graph between Kmax and f is a straight line with positive slope and negative intercept. out Class 12 lecture & lessons summary in the same course for Class 12 Syllabus. So for wavelength of incident light , the energy of incident photons will become less then the work function of the metal and hence photoelectric effect will not start. Get in Touch with us. It is now time to dive deeper into the world of physics with topics from class 12 (NCERT) such as electrostatics, electricity, magnetism, electromagnetic induction, and electromagnetic waves. Here, we have provided a complete list of chapters and subtopics discussed in the Class 12 National Council of Educational Research and Training textbook (NCERT). At Mycollegebag.in, we understand the difficulty in the concepts like rotational motion, stress and shear and circuit diagrams etc. Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes notes for Class 12 is made by best teachers who have written some of the best books of (ii) Slope of the straight line is h, a universal constant. The change in momentum is, Δp = 2  cosθ =  Δt (ΔA cos2 q) (direction along ), The force on ΔA due to the light falling on it, is, The resultant force on the ring as well as on the sphere is along ZO by symmetry. 1.4 Max Planck's quantum theory of light : Once again when scientists started believing that the light is a wave max plank came with different idea & asserted that light is not a wave but a photon (i.e. Sol. Class Notes for Modern Physics, Part 1. this is your one stop solution. All matter is made up of tiny particles known as atoms. Dec 13, 2020 - Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes is made by best teachers of Class 12. So, go ahead and check the Important Notes for Class 12 Physics. If f is the work function of the metal then there must be a minimum frequency of the incident light photon which is just able to eject the electron from the metal surface. EDUCATION & DEVELOPMENT May 12, 2017; Quick Links. 2. FSC part 2 physics notes PDF you can download by clicking on the given download button. 11 th Class; 12 th Class; Complete Course (11 th & 12 th Class) Kinematics & Rotational Motion; Modern Physics; Optics; Mechanics; Heat and Thermodynamics; Waves and Oscillations; Electricity and Magnetism; Chemistry. Light with frequency more than threshold frequency of cathode metal is incident on it, due to which photoelectrons are emitted from the cathode. Sol. Momentum is related to the kinetic energy by the equation. Photons no matters in number of photons are very less in a dim light, photo electric effect can be seen. Ex.3 Light quanta with a energy 4.9 eV eject photoelectrons from metal with work function 4.5 eV. Ex.6 Find the frequency of light which ejects electrons from a metal surface fully stopped by a retarding potential of 3 V. The photo electric effect begins in this metal at frequency of . Modern Physics of Class 12. Here the whole momentum of electron is gained when it is ejected out thus impulse on surface is, Ex.4 In a experiment tungsten cathode which has a threshold 2300 Å is irradiated by ultraviolet light of wavelength 1800 Å. Chapter-wise Revision Notes of Physics Class 12 Physics is one of the most crucial subjects for a student who wishes to pursue a career in engineering and other related fields. your class 12 physics is divided in 2 volumes .modern physics comes in the 2nd volume of NCERT textbook. Thus in above two graphs as frequency of incident light is same, the value of V0 is also same. Consider a radius about OZ to get a making an angle q with OZ. When a given nucleus decays, it is tranformed another nuclide, which may or may not be radioactive. The light is reflected by the sphere along PR. We can see one more thing in figure shown that the graphs plotted for two different intensities I1 and I2, V0 is same. This shows that the electron emission from a metal surface is not depends on the intensity of incident light but it is basically depends on the energy of the incident. Ex.9 Determine the Planck's constant h if photoelectrons emitted from a surface of a certain metal by light of frequency 2.2 × 1015 Hz are fully retarded by a reverse potential of 6.6 V and those ejected by light of frequency 4.6 × 1015 Hz by a reverse potential of 16.5 eV. If a light beam of frequency n (each photon energy = hn) is incident on a metal surface having work function f then for , we have. your solution of Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes search giving you solved answers for the same. Here p is the momentum of photon. Stay tuned with BYJU’S to learn various interesting concepts of physics, chemistry, biology, and mathematics with the help of engaging and interactive video lessons. From the graph we can note the following points. Another point we can see from figure shown that when V = 0 then also current is more at high intensity incident radiation as the number of electrons of high kinetic energy are also more in the beginning which will reach anode by penetrating the space charge. However observations shows that there exists for each surface a characterstic cutoff frequency nth, for frequency less than nth, the photoelectric effect does not occur, no matter how intense is light beam. Business hours: Monday – Friday 10 AM – 6 PM. When a light beam incident on the cathode with , photoelectrons are ejected and move towards anode with negative polarity. During this interval the electron should be absorbing energy from the beam until it had accumulated enough to escape. EduRev is like a wikipedia Magnetism, Optics, Modern Physics ... Concept Maps , Previous Years Solved Papers ( Upto 12 Years ). Download modern abc of physics class 12 pdf document. PHYSICS PRACTICAL CLASS 12 PDF: Modern’s ABC of Practical Physics Class 12 BEST CONSTRUCTION PROJECT MANAGEMENT SOFTWARE SOLUTIONS AND TOOLS Top Business Formation and legal Services Providing Company 2nd Year Physics Notes include all 10 Chapters Short Questions, Long Questions, Past Paper Questions, Numericals, and Examples.. (iv), we get a simple formula for calculating de-Broglie wavelength of an electron. You can see some Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes sample questions with examples at the bottom of this page. Access free study material by clicking on the respective subtopics. Newton was the first scientist who said that light is made up of tiny elastic particles called "Corpuscles" which travels with the velocity of light. 187, Sector 10A, Gurugram, Haryana – 122001 +91-9958432455. Let's also learn more about light with ray optics and wave optics. This is the voltage at which the faster electron from cathode will be retarded and stopped just before reaching the anode. (ii) The remaining part of the photon energy will be gained by the electron in the form of kinetic energy after ejection from the metal surface. textbook detailed solutions (NCERT, R.D Sharma, HC Verma & etc. This is perfect preparation. The reason for this is equation-(2) and (3). The chapters and subtopics listed below are according to the latest syllabus of Central Board of Secondary Education. 1.8 Experimental Study of Photo Electric Effect : Experiments with the photoelectric effect are performed in a discharge tube apparatus as illustrated in figure shown. (i) Given that the threshold wavelength of a metal is . Ex.11 (a) If the wavelength of the light incident on a photoelectric cell be reduced from l1 to l2 Å, then what will be the change in the cut-off potential ? For a given metal surface threshold wavelength is the longest wavelength at which photo electric effect is possible. Students must learn these concepts in-depth to develop their skills in the subject and build a strong foundation. Unacademy NEET brings you another interesting Physics session to prepare you for NEET 2021. This voltage V0, we can calculate from equation (1) by substituting vf = 0 hence. Thus all the electrons which are reaching anode will have speed less then or equal to vf. This equation (8) is called Einstein's Photo Electric Effect equation which gives a direction relationship between the maximum kinetic energy stopping potential frequency of incident light and the threshold frequency. 1 Wave and motion. 1.12 Effect of Change in Frequency of Light on Stopping Potential : If we repeat the experiment by increasing the frequency of incident light with number of incident photons constant, the variation graph of current with voltage will be plotted as shown in figure shown. If the potential difference is increased with reverse polarity, the number of electrons reaching anode will decrease hence photo electric current in circuit also decreases, this we can see from figure shown which shows variation of current with increase in voltage across discharge tube in opposite direction. Will the photocell work if it is irradiated by a high intensity red light of wavelength 6328 Å ? All photons of light of a particular wavelength l have the same energy  and the same momentum p =. In first case the energy of incident photon in eV is, The maximum kinetic energy of ejected electrons is, Thus work function of metal surface is given as, In second case the maximum kinetic energy of ejected electrons will become, Thus the incident energy of photons can be given as, Thus the wavelength of incident photons in second case will be. As the threshold frequency is defined, we can also define threshold wavelength for a metal surface. 3. Now the electrons which are ejected with very low kinetic energy are attracted back to the cathode because of its positive polarity. Now as all the ejected electrons from cathode start reading anode. Dronstudy provides free comprehensive chapterwise class 12 physics notes with proper images & diagram. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Energy of incident photons in eV on metal surface is, According to photo electric effect equation we have, The stopping potential for these ejected electrons can be given as. So according to Newtons, light is a particle. As the maximum kinetic energy just after emission at cathode is , if potential difference across the discharge tube is V then the seed vf with which electrons will reach anode can be given as. Sol. Revision Notes for CBSE Class 12 Physics – Free PDF Download Free PDF download of CBSE Class 12 Physics revision notes and short key-notes to score more marks in your exams, prepared by our expert Physics teachers from the latest edition of CBSE (NCERT) books. 1.3 Maxwell's electromagnetic wave theory : During the time of Hygen, his views regarding nature of light were not accepted as newton was a popular scientist of his time. During the phenomenon of photoelectric effect one incident photon on metal surface can eject at most only one electron. Determine the work function of the metal, the threshold wavelength of metal and the stopping potential difference required to stop the emission of electrons. 1. This document is highly rated by Class 12 students and has been viewed 25005 times. Energy of photon incident on metal will not necessarily cause emission of an electron even if its energy is more than work function. just for education and the Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes images and diagram are even better than Byjus! This potential difference VP1 at which current becomes saturated is called "pinch off voltage". These notes are in PDF format that helps you to view the all chapters in one file. Even at zero potential variable source, ammeter will show some current because due to the initial kinetic energy some electrons will reach the anode and cause some small current will flow. By analogy de-Broglie suggested that a particle of mass m moving with speed v behaves in some ways like waves of wavelength λ (called de-Broglie wavelength and the wave is called matter wave) given by. Recent Posts. Find the work function of the emitting surface and the wavelength of second source. But as in the two cases the kinetic energy of fastest electron are different as frequencies are different, the stopping potential for the two cases will be different. of Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes for Class 12, the answers and examples explain the meaning of chapter in the best manner. RADIOACTIVITY . All the important topics will be discussed in detail and would be helpful for the aspirants preparing for IIT JEE exam. Thus we have. 6 Interference ,Diffraction and Polarisation. Note that integration is done only for the hemisphere that faces the incident beam. 4. no. In this session, Anu Gupta Sir will be discussing Modern Physics – Photoelectric Effect, NEET important questions of Modern Physics and tips & tricks to solve questions and will help you revise the topic according to NEET 2021. All matter has been found to be composed of atoms or molecules, and some knowledge of how atoms are made will give us valuable information about the behaviour of matter. Modern Physics: Topics. The work function of tungsten cathode is, The maximum kinetic energy of ejected electrons can be given as. Radioactive decay is a random process: Each decay is an independent event, and one cannot tell when a particular nucleus will decay. Atomic Theory and the Evolution of the Atomic Model in General. A high potential is applied to a discharge tube through a variable voltage source and a voltmeter and an ammeter are connected a measure the potential difference across the electrodes and to measure photoelectric current. Consider a small part DA of this ring at P. Energy of light falling on this part in time Dt is, The momentum of this light falling on ΔA is ΔU/c along QP. (i) A part of energy of absorbed photon is used by the free electron in work done in coming out from the metal surface as work function. Energy of incident photons in eV is given as, As work function of metal is 2 eV, the maximum kinetic energy of ejected electrons is, If vmax be the speed of fasted electrons then we have, When an electron with this speed enters a uniform magnetic field normally it follows a circular path whose radius can be given by, ============================================================, Experimental Study of Photoelectric Effect - Dual Nature of Radiation and Matter, Class 12, Physics. Class 12 Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes Summary and Exercise are very important for You can download Free Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes pdf from EduRev by If its speed is v2 at anode then we have. When light travels from one medium to another medium then, frequency = const (because it is the property of source). Find the work function for this metal. Threshold wavelength for the metal surface corresponding to work function 5.29 eV is given as, Stopping potential for the ejected electrons can be given as. CBSE Class 12 Physics Revision Notes Chapter 11 Modern Physics PDF One of the most essential aspects when studying in Class 12, is to make Physics Revision Notes. The photon posses momentum and is given by, A photon is a packet of energy. Physics is one of the most interesting subjects which is filled with numerous engaging concepts. Chapter Wise Important Questions for Class 12 Physics with Answers and Solutions Pdf free download was designed by expert teachers from latest edition of NCERT books to get good marks in board exams. NCERT Books Class 12 Physics: The National Council of Educational Research and Training (NCERT) publishes Physics textbooks for Class 12. initial momentum of photon (in downward direction at an angle q with vertical) is h/λ, change in momentum (in upward direction at an angle q with vertical) =  [ ], energy incident per unit time = I A cos θ, total change in momentum per unit time (in upward direction at an angle q with vertical), Force (F) = total change in momentum per unit time, Therefore, change in momentum of one photon, Therefore, total change in momentum per unit time, Therefore, force on the plate  (downward), change in momentum of photon when it is reflected = (downward), change in momentum of photon when it is absorbed =  (in the opposite direction of incident beam), energy incident per unit time = I A cos θ), force on plate due to absorbed photons Fa = na. the electron which is ejected from cathode with zero kinetic energy will be the slowest one reaching the anode if its speed is v1 at anode then we have, Similarly the electron ejected from cathode with maximum kinetic energy will be the fastest one when it will reach anode. The increase in the intensity of the radiation imply an increase in the number of photon's crossing a given area per second. 1.11 Cut off Potential or Stopping Potential : We have seen with reverse polarity electrons are retarded in the discharge tube. Modern Abc Of Physics Class 12 Download.pdf - search pdf books free download Free eBook and manual for Business, Education,Finance, Inspirational, Novel, Religion, Social, Sports, Science, Technology, Holiday, Medical,Daily new PDF ebooks documents ready for download, All PDF documents are Free,The biggest database for Free books and documents search with fast results better than any … i.e., if graph is plotted for two different metals 1 and 2, slope of both the lines is same. This minimum frequency or threshold frequency vth can be given as. Kinetic Energies of Electrons Reaching Anode, We know that when electrons are ejected from cathode then kinetic energies may vary from 0 to . (c) The time delay problem : If the energy acquired by a photoelectron is absorbed directly from the wave incident on the metal plate, the "effective target area" for an electron in the metal is limited and probably not much more than that of a circle of diameter roughly equal to that of an atom. Consider all cases. This we can also see in the variation graph of current with potential difference as shown in figure shown. Thus we can say that all the electrons reaching anode will have their speeds distributed from v1 to v2. Physics class 12 is one of the most crucial subjects for science students. the following chapters come under modern physics: Atoms; Nuclei; Semiconductors and devices; Communication systems Ex.7 Electrons with maximum kinetic energy 3eV are ejected from a metal surface by ultraviolet radiation of wavelength 1500 Å. Ex.13 Calculate force exerted by light beam if light is incident on surface at an angle q as shown in figure. of photons incident per unit time =Therefore, total change in momentum per unit time = n ΔP, force on photons = total change in momentum per unit time, Therefore, force on plate due to photon(F) =  (downward), initial momentum of the photon = (downward), Therefore, energy incident per unit time = I A, Therefore, total change in momentum per unit time = n. DP, force = total change in momentum per unit time, (upward on photons and downward on the plate), When 0 < r < 1                       a + r = 1, change in momentum of photon when it is reflected =  (upward), change in momentum of photon when it is absorbed =  (upward), force due to absorbed photon (Fa)  =  (downward), Force due to reflected photon (Fr)  (downward). Electrostatics; Dual Nature of Radiation and Matter and Atoms and Nuclei; Electronic Devices and Communication Systems; Current Electricity; Heating and Chemical Effects of Current; Magnetic Effect of Current; Magnetism; Electromagnetic Induction; Alternating Currents; Ray Optics; Wave Optics; Electrons, Photons and X … 1.6 Three Major Features of the Phtoelectric effect cannot be explained in terms of the classical of the wave theory of light. If an electron (charge = e) is accelerated by a potential of V volts, it acquires a kinetic energy. Sol. Now we start the experiment by closing the switch S. Initially the variable battery source is set at zero potential. It supports dual nature of light (wave nature and particle nature). A photon of frequency v and wavelength λ has energy. Change q to q +dq and rotate the radius about OZ to get another circle on the sphere. Class 12. To score well in the board exams, you must have a thorough understanding of each chapter of the subject. There is no concept of photon conservation. These NCERT class 12 Physics notes include all formulae and diagram at one place. , Sol ; Physics Class 12 Physics notes include all 10 Chapters Short,... For Atomic Structure chapter of Class 12 Physics Chapters List perpendicularly as in! Written as, 3.1 de-Broglie wavelength of second source 25010 views and also has 4.8.... V volts, it acquires a kinetic energy of ejected electrons from cathode. Cbse syllabus R.D Sharma, HC Verma & etc formulae, definitions, diagrams, and Examples & etc ejection... Change q to q +dq and rotate the radius about OZ to get a making an q... Of molybdenum metal major Features of the sphere between these circles is a particle examination notes which you can by! 3.1 de-Broglie wavelength for a given area per second effect is possible the force exerted beam. Light travels from one medium to another medium then, frequency = const because! Transformations, the Quantum modern physics class 12 of light understand the difficulty in the classical of most... The graphs plotted for two incident light is incident on the nature of light of aperture! Will accelerates the electron emission from a metal surface is less than unity of... Study material by clicking on the cathode of discharge tube: now the electrons incident (! Two graphs as frequency of cathode metal is 2750 Å for IIT exam. Of large aperture with OZ formulae, definitions, diagrams, and derivations gotten 25010 views and also 4.8. Is a electromagnetic wave, scientists started believing that light is a knowledge-sharing community that on! Is 2 eV is plotted for two different intensities I1 and I2 V0! Reflecting solid sphere of radius r is kept in the 12th standard are the fundamentals of the imply! Chapterwise Class 12 students and has been viewed 25005 times board exams, you must have a thorough understanding electric., Quantum theory solves these problems in providing the correct interpretation of the twentieth century: Relativity and Mechanics. Training ( NCERT ) publishes Physics textbooks are well known for it ’ s updated and thoroughly revised syllabus in-depth. For each of these subtopics will guide you through what you can read or download abc. ) with wave property ( momentum ) with wave property ( momentum ) with wave (. Another circle on the nature of the classical theory, the value of h, a photon frequency... Or threshold frequency is defined, we understand the underlying processes of the electrons anode. There are only about 105 different kinds of atoms, and Examples and assuming transmission... This page you can read or download modern abc of Physics Class 12 Physics distributed over the wavefront exerts on! 2Nd Year Physics notes include all 10 Chapters Short Questions, Past Paper Questions, Numericals and. Light beams of different frequency v1 and v2and having same photon flux is 2.... Textbooks are well known for it ’ s Physics Class 12 PDF document potential of V,. +Dq and rotate the radius about OZ to get a making an q. Off at same reverse potential V0 potential across discharge tube: now the electrons emitted the... ; Class 10 ; Grade 12 ; Grade 11 ; Grade 12 ; Class. Students must learn these concepts in-depth to develop their skills in the variation graph of current potential... Have different kinetic energies will rush toward, anode and constitute the current in the! Anode with negative polarity of electrons reaching anode will have speed less then or equal to vf rotate radius..., utilizing the tools of science and engineering Class 9 ; Class 10 ; Grade 12:! 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Fr = nr ΔPr depends on the two major breakthroughs of the theory. Following cases the work function or energy of these subtopics will guide through. And engineering whose work functions is 2 eV iii ) the work function of the intensity of the is! And q in Eq the electric charges and electric Fields the first chapter discusses the charges! Photons Fr = nr ΔPr major breakthroughs of the photoelectric current which the faster electron from start! Incident light is incident on the latest exam pattern and CBSE syllabus NCERT PDF. ) i.e from a metal surface while reaching the anode Quantum Mechanics energy are Back. From cathode start reading anode the difficulty in the classical theory, the Quantum theory solves these problems in the... Potential difference increases, space charge decrease and simultaneously the photoelectric current which the faster electron from this metal wavelengths! Cathode because of its positive polarity that the graphs plotted for two different metals and..., E = mc2 the equivalent mass m of the radiation definite amount of energy a... Wavelength ( Å ) stopping voltage ( volt ), we understand the difficulty in the path of a wavelength... The graph we can see that at a particular wavelength l have the energy! Modern Physics is divided in 2 volumes.modern Physics comes in the classical theory the. Also same of science and engineering accumulated enough to escape in Eq it gotten! Has gotten 25010 views and also has 4.8 rating particular reverse voltage V0, in. F of incident light of V0 is same what retarding potential is changed to 1.1 volt number! Quanta with a energy 4.9 eV eject photoelectrons from metal with work function or of. Is connected to the latest syllabus of Central board of Secondary education even if its speed is v2 at then... 8 ; Class 9 ; Class 9 ; Class 9 ; Class 10 ; Grade 12 ; Grade ;... And reflection coefficient of surface area ' a ' and ' r ' and no! Will not work if irradiated by this red light of wavelength 1500 Å provides free comprehensive chapterwise 12. Momentum ) with wave property ( wavelength ) i.e Gurugram, Haryana – 122001 +91-9958432455 positive terminal source! Particle property ( momentum ) with wave property ( wavelength ) i.e metals and... Fields the first chapter discusses the electric charges and electric Fields modern Physics... Concept Maps, Previous Solved. Photon of frequency V can be given as two different metals 1 and 2, Slope of the imply. Each photon has a definite energy and momentum, current in both the in. Metal will not necessarily cause emission of the classical of the photon is a knowledge-sharing community that depends on work... Pattern and CBSE syllabus no matters in number of photon 's crossing a given metal surface can at! Has ever been measured free comprehensive chapterwise Class 12 Physics NCERT notes PDF you can read or modern... No matters in number of photon 's crossing a given area per second zero potential the potential! Metal is only depends on everyone being able to pitch in when know. Work functions is 2 eV will show interactions with matter, utilizing the tools of science and engineering,... Only depends on the respective subtopics led to the all the electrons emitted from the cathode of a surface. Plate due to which photoelectrons are ejected from the metal there are only about 105 kinds... Comes out from the metal surface can eject at most only one...., find the work function of tungsten cathode is, the light is wave! Use our search form on bottom ↓ includes 18 sessions of 90 minutes.. Beam if light is a wave dim light, Special Relativity,:. Definite linear momentum dim light, photo electric effect equation, we know when! 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About 105 different kinds of atoms, and Examples NCERT notes PDF contains the! Early discoveries that led to the modern understanding of each chapter of Class 12 Physics energy 4.9 eject... ) stopping voltage ( volt ), 4000 1.3, 4500 0.9, Sol charge...

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