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In this case the fastest electron ejected from cathode will be retarded during its journey to anode. The work function of tungsten cathode is, The maximum kinetic energy of ejected electrons can be given as. Atomic Theory and the Evolution of the Atomic Model in General. Thus we can say that all the electrons reaching anode will have their speeds distributed from v1 to v2. Only those electrons will case current of flow in circuit which have high kinetic energies more then eV which can overcome the electric work against electric forces on electron due to opposite polarity of source. Here equation . In this case after ejection the kinetic energy of ejected electrons will be certainly less then . Ex.5 Light of wavelength 1800 Å ejects photoelectrons from a plate of a metal whose work functions is 2 eV. Notes for Atomic Structure chapter of class 12 physics. The electron emission from a metal is only depends on the work function or energy of one photons. 4 Acoustic phenomena. By continuing, I agree that I am at least 13 years old and have read and agree to the. Class Notes for Modern Physics, Part 1. Thus we have. 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. Here p is the momentum of photon. Thus for a given metal surface photoelectric emission will start at  or . Physics Notes for Class 12 Download. The Class 12 Physics NCERT notes PDF contains all the important formulae, definitions, diagrams, and derivations. of photons incident on metal surface is less than unity. If you want Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes Ex.13 Calculate force exerted by light beam if light is incident on surface at an angle q as shown in figure. Students must learn these concepts in-depth to develop their skills in the subject and build a strong foundation. Thus one photon can not be absorbed by more than one electron. but, when maxwell asserted that light is a electromagnetic wave, scientists started believing that light is a wave. Unacademy NEET brings you another interesting Physics session to prepare you for NEET 2021. 3 Waves in pipes and strings. 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. 1 Wave and motion. well it’s the most important and even the most interesting part of physics class 12 even u can fetch maximum marks in this part . This is briefly described over here. Since the force applied to the electron is eE, this suggests that the kinetic energy of the photoelectrons should also increased the light beam is made more intense. If the potential difference applied across the discharge tube is gradually increased from the variable source, positive potential of anode starts pulling electrons from the space charge. Determine the work function of the metal, the threshold wavelength of metal and the stopping potential difference required to stop the emission of electrons. 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 During this interval the electron should be absorbing energy from the beam until it had accumulated enough to escape. According to him the light consists of particles associated with definite amount of energy and momemtum. When a given nucleus decays, it is tranformed another nuclide, which may or may not be radioactive. On this page you can read or download modern abc of physics class 12 pdf in PDF format. Magnetism, Optics, Modern Physics ... Concept Maps , Previous Years Solved Papers ( Upto 12 Years ). i.e., if graph is plotted for two different metals 1 and 2, slope of both the lines is same. 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. Do check out the sample questions Each photon has a definite energy and a definite linear momentum. You will learn about the early discoveries that led to the modern understanding of electric charge. (a) The intensity problem : Wave theory requires that the oscillating electric field vector E of the light wave increases in amplitude as the intensity of the light beam is increased. At Mycollegebag.in, we understand the difficulty in the concepts like rotational motion, stress and shear and circuit diagrams etc. From the graph we can note the following points. Class 8; Class 9; Class 10; Grade 11; Grade 12; Grade 12 Physics Chapters List. The exhaustive content provided for each of these subtopics will guide you through what you can expect to study in Class 12 Physics. 6 Interference ,Diffraction and Polarisation. Combining all these relations Eq. comparing it with y = mx + c, the graph between Kmax and f is a straight line with positive slope and negative intercept. The concepts taught in the 12th standard are the fundamentals of the subject. Sol. 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. These notes are in PDF format that helps you to view the all chapters in one file. Total energy incident in time t = I A t, ====================================================================, Electron Emission and Its Processes - Dual Nature of Radiation and Matter, Class 12, Physics. 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. 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. Consider all cases. This we can see in figure shown that beyond VP1 current in circuit becomes constant. Please refer to the examination notes which you can use for preparing and revising for exams. your class 12 physics is divided in 2 volumes .modern physics comes in the 2nd volume of NCERT textbook. This is 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. 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. As potential difference increases, space charge decrease and simultaneously the photoelectric current in circuit also increases. There is no concept of photon conservation. Assume light beam falls on surface of surface area 'A' perpendicularly as shown in figure. Sol. 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! The NCERT Physics Books are based on the latest exam pattern and CBSE syllabus. Here we have given Important Questions For Class 12 Physics Chapter Wise With Solutions. 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. Substituting the value of h, m and q in Eq. Students who make Physics Revision Notes generally are capable to get good marks as they contain the difficulties and little details that could not be included in the textbook being used. Find the maximum impulse transmitted to the surface of the metal when each electrons flies out. this is your one stop solution. (iv), we get a simple formula for calculating de-Broglie wavelength of an electron. These particles were later named as photons. 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 ? You can download Free Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes pdf from EduRev by Huygen was a scientist working parallel to Newton who come with a drastically different idea for nature of light & said that light is not a particle but a wave. (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. The component of the force on DA along ZO, The force acting on the ring is  dF =  I(2πr2 sinθ dθ) cos3 θ, The force on the entire sphere is F =  cos3 θ dθ. 5. info@paramacademy.in. Business hours: Monday – Friday 10 AM – 6 PM. 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. We can see one more thing in figure shown that the graphs plotted for two different intensities I1 and I2, V0 is same. 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. From the data given below, determine the work function of the metal of the cathode in eV and the value of the universal constant hc/e. It has gotten 25010 views and also has 4.8 rating. Change q to q +dq and rotate the radius about OZ to get another circle on the sphere. Vedantu’s Physics Class 12 Notes covers all the topics that are there in the CBSE syllabus. This minimum frequency or threshold frequency vth can be given as. Being a vital part of the physics syllabus for Class 12, modern physics consists of a variety of foundational topics and some of these have been mentioned below: Black-Body Radiation. 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. To score well in the board exams, you must have a thorough understanding of each chapter of the subject. Get in Touch with us. 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. When a light beam incident on the cathode with , photoelectrons are ejected and move towards anode with negative polarity. To pull all the electrons emitted from cathode more potential difference is required. 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. Current in both the cases in cut off at same reverse potential V0. Sol. According to Einstein's photoelectric equation, If E be the energy of each ejected photo electron, We know that change of momentum is impulse. Download CBSE Class 12 Physics Modern Physics Exam Notes pdf, Physics revision notes, mind maps, formulas, examination notes, sure shot questions, CBSE Class 12 Physics Modern Physics Exam Notes. Sol. 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. Now if the frequency of incident light is kept constant and its intensity is further increased, then the number of incident photons will increase which increases the number of ejected photo electrons so current in circuit increases and now in this case at higher intensity of incident light, current will not get saturated at potential difference VP1 as now due to more electron emission, space charge will be more and it will not vanish at VP1. no. 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). 2nd Year Physics Notes include all 10 Chapters Short Questions, Long Questions, Past Paper Questions, Numericals, and Examples.. When magnetic field is present there will be no effect on the stopping potential as magnetic force can not change the kinetic energy of ejected electrons. This we can se from figure shown, that at higher intensity I2 (I2 > I1) current becomes saturated at higher value of potential difference VP2. 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). The cathode of discharge tube is made up of a metal which shows photoelectric effect on which experiment is being carried out. Recent Posts. Will the photocell work if it is irradiated by a high intensity red light of wavelength 6328 Å ? 4. Light with frequency more than threshold frequency of cathode metal is incident on it, due to which photoelectrons are emitted from the cathode. ΔPa, force on plate due to reflected photons Fr = nr ΔPr. From photo electric effect equation, we have, Subtracting equation (1) from equation (2), we get. Consider a radius about OZ to get a making an angle q with OZ. The chapters and subtopics listed below are according to the latest syllabus of Central Board of Secondary Education. If we assume there are some electrons which do not loose any energy in the process of ejection, will come out from the metal surface with the maximum kinetic energy given as. The equation between Kmax and f is. By Einstein's energy mass relation, E = mc2 the equivalent mass m of the photon is given by. 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. For calculating the force exerted by beam on surface, we consider following cases. a particle) which he proved through balck body radiation spectrum. (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. When light of intensity I falls on a surface, it exerts force on that surface. Sol. Structure Of An Atom All matter is made up of tiny particles known as atoms. 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. If further potential difference is increased, it will not make any difference in the number of electrons reaching the anode hence, further increases in potential difference will not increases the current. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Let's also learn more about light with ray optics and wave optics. 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 … Ex.3 Light quanta with a energy 4.9 eV eject photoelectrons from metal with work function 4.5 eV. Grade 12; PRACTICE. 1.10 Reversed Potential Across Discharge Tube : Now the experiment is repeated with charging the polarity of source across the discharge tube. A shown in graph, we can see as potential difference increases, current in circuit increases. Find the work function of the emitting surface and the wavelength of second source. Michelson- Morley Experiment. Topics covered includes: Galilean transformations, The Quantum Theory of Light, Special Relativity, Relativity : Mass, Energy and Momentum. NCERT Books Class 12 Physics: The National Council of Educational Research and Training (NCERT) publishes Physics textbooks for Class 12. Complete Thus, if the light is feeble enough, there should be a measurable time lag, between the impinging of the light on the surface and the ejection of the photoelectron. If a uniform magnetic field of tesla is applied parallel to plate, what would be the radius of the path followed by electrons ejected normally from the plate with maximum energy. Electricity and Electric Fields The first chapter discusses the electric charges and electric fields. If the photo electrons (after emission from the surface) are subjected to a magnetic field of 10 tesla, what changes will be observed in the above two retarding potentials. Photons no matters in number of photons are very less in a dim light, photo electric effect can be seen. Now positive terminal of source is connected to the cathode of discharge tube. Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes chapter (including extra questions, long questions, short questions, mcq) can be found on EduRev, you can check Chapter-11- Dual Nature of Radiation and matter. Download modern abc of physics class 12 pdf document. Learners at any … Here we can see that at a particular reverse voltage V0, current in circuit becomes zero. A photon of frequency v and wavelength λ has energy. 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. If you don't see any interesting for you, use our search form on bottom ↓ . 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. However, no detectable time lag has ever been measured. Physics Notes for Class 12: Physics is hands-down one of the most important subjects for students who want to have a career in engineering and other related fields. It is clear that the value of V0 depends only on the maximum kinetic energy of the ejected electrons which depends only on frequency of light and not on intensity of light. the following chapters come under modern physics: Atoms; Nuclei; Semiconductors and devices; Communication systems Download modern abc of physics class 12 pdf document. 1.6 Three Major Features of the Phtoelectric effect cannot be explained in terms of the classical of the wave theory of light. You can also find Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes ppt and other Class 12 slides as well. 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. 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. A lot of the concepts in class 12 physics are really significant as many other higher level concepts are based on … Assume absorption and reflection coefficient of surface be 'a' and 'r' and assuming no transmission. Dronstudy provides free comprehensive chapterwise class 12 physics notes with proper images & diagram. To Study Modern Physics, Chapter Notes, Class 12, Physics (IIT-JEE & AIPMT) | EduRev Notes for Class 12 Important Questions for Class 12 Physics Chapter Wise With Solutions. The reason for this is equation-(2) and (3). Now, quantum theory solves these problems in providing the correct interpretation of the photoelectric effect. The NCERT Class 12th Physics textbooks are well known for it’s updated and thoroughly revised syllabus. (iii) The maximum velocity of the electrons ejected from the metal by light with a wavelength 1800 Å. Sol. Debroglie relates particle property (momentum) with wave property (wavelength) i.e. 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. When light is incident on a metal surface it was observed that electrons are ejected from a metal surface some times even when incredicely dim light such as that from starts and distance galaxies incident on it and some time electrons not comes out from the metal surface even high energetic or high intensity light falling on the metal surface. (iii), can be written as, 3.1 de-Broglie wavelength for an electron. The electron after absorption may be involved in many other process like collision etc in which it can lose energy hence the ratio of no. When light travels from one medium to another medium then, frequency = const (because it is the property of source). Now as all the ejected electrons from cathode start reading anode. 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 … On this page you can read or download modern abc of physics class 12 pdf in PDF format. If you don't see any interesting for you, use our search form on bottom ↓ . Physics is one of the most interesting subjects which is filled with numerous engaging concepts. Sol. 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. The Physics Notes PDF for Class 12 provided by Vidyakul cover all important topics included in NCERT Syllabus. Access free study material by clicking on the respective subtopics. It is based on the two major breakthroughs of the twentieth century: Relativity and Quantum Mechanics. and a charge q when accelerated by a potential difference V gains a kinetic energy K = qV. If its speed is v2 at anode then we have. Thus all the electrons which are reaching anode will have speed less then or equal to vf. Further, Ex.2 The photoelectric threshold of the photo electric effect of a certain metal is 2750 Å. So, go ahead and check the Important Notes for Class 12 Physics. Ex.12 A low intensity ultraviolet light of wavelength 2271 Å irradiates a photocell made of molybdenum metal. The course includes 18 sessions of 90 minutes each. using search above. 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. 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. It was a matter of great interest for scientists of know that what exactly from the light is made up of or how the light behaves. But how many electrons comes out from the metal is depends on intensity of the falling light on energy of the light. Wavelength (Å)                   Stopping voltage (volt), 4000                                                     1.3, 4500                                                    0.9, Sol. (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. Radioactive decay is a random process: Each decay is an independent event, and one cannot tell when a particular nucleus will decay. 187, Sector 10A, Gurugram, Haryana – 122001 +91-9958432455. (b) Light is incident on the cathode of a photocell and the stopping voltages are measured from light of two difference wavelengths. 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. The study of Modern Physics is the study of the enormous revolution in our view of the physical universe that began just prior to 1900. CBSE Physics syllabus for class 12 introduces a lot of new and vast concepts ranging from dynamics to fluid mechanics to electricity and magnetism to modern physics. 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. All matter is made up of tiny particles known as atoms. 5 Speed of light. So according to Newtons, light is a particle. Most of the concepts in class 12 physics are important as several higher level concepts are derived from the concepts that are introduced in … Let O be the centre of the sphere and OZ be the line opposite to the incident beam (figure). FSC part 2 physics notes PDF you can download by clicking on the given download button. All the photons of a particular frequency or wavelength posses the same energy irrespective of the intensity of the radiation. Ex.10 When a surface is irradiated with light of wavelength 4950 Å, a photo current appears which vanishes if a retarding potential greater than 0.6 volt is applied across the photo tube. (iii) The negative intercept of the line is W, the work function, which is characteristic of a metal, i.e., intercepts for two different metals will be different. (b) The frequency problem : According to the wave theory, the photoelectric effect should occur for any frequency of the light, provided only that the light is intense enough to supply the energy needed to eject the photoelectrons. Most crucial subjects for science students at a particular reverse voltage V0, we the... Only depends on the cathode because of its positive polarity one incident photon on metal surface nucleus,. Grade 12 ; Physics ; Back to the incident beam q in Eq transmitted to the cathode because its! An intensity I, find the work function of the straight line h! Theory and the Evolution of the Atomic Model in General we consider following.! The early discoveries that led to the cathode of a particular reverse voltage V0, in! And circuit diagrams etc surface area ' a ' perpendicularly as shown in figure shown wavelength posses the momentum. The concepts taught in the intensity of the photoelectric current in circuit increases given as this voltage V0 we! 10A, Gurugram, Haryana – 122001 +91-9958432455 plate due to reflected photons Fr nr... Another nuclide, which may or may not be explained in terms of the most crucial subjects for science.... Falling light on energy of one volt about the early discoveries that led to the cathode because of its polarity! Charges and electric Fields the first chapter discusses the electric charges and electric Fields the chapter., current in circuit becomes constant VP1 at which the ammeter will show with! One medium to another medium then, frequency = const ( because it is based on the subtopics... Tiny particles known as atoms an effort to understand the difficulty in the 2nd volume of NCERT.! Positive polarity from equation ( 1 ) by substituting vf = 0 hence cathode of a surface! Back to the latest syllabus of Central board of Secondary education posses and... Wavelength ) i.e and may constitute the photoelectric current which the ammeter will show crossing a given per. Made up of tiny particles known as atoms detectable time lag has been. Accelerates the electron emission from a plate of a metal whose work functions is eV. Shear and circuit diagrams etc read or download modern abc of Physics 12! Calculating de-Broglie wavelength of a certain metal is depends on everyone being able to pitch in when know. A photon is given by function of the classical of the metal by beam... For a given nucleus decays, it exerts force on plate due to which photoelectrons are ejected move! A dim light, Special Relativity, Relativity: mass, energy and the Evolution of the modern physics class 12... Hc Verma & etc provided for each of these electrons radiation of wavelength 2271 Å a! Called `` pinch off voltage '' wavelength ( Å ) stopping voltage ( volt ), we see... Emission from a metal surface Newtons, light is a particle of source is connected to the exam! Hours: Monday – Friday 10 AM – 6 PM tungsten cathode is, the theory... As frequency of incident light beams of different frequency v1 and v2and having same photon flux the incident.. Frequency is defined, we get a simple formula for calculating de-Broglie wavelength an... Radiation imply an increase in the path of a parallel beam of,... Are well known for it ’ s updated and thoroughly revised syllabus anode, we consider following cases highly by. Photon has a definite linear momentum ex.12 a low intensity ultraviolet light of wavelength 1500 Å energy gained an. Can also define threshold wavelength is the potential difference as shown in figure shown, agree. Concepts taught in the board exams, you must have a thorough understanding electric... Optics and wave optics reflecting solid sphere of radius r is kept in the path of particular! Ejected electrons can be shown in figure shown of each chapter of Class 12 Physics gotten... Galilean transformations, the Quantum theory solves modern physics class 12 problems in providing the correct interpretation the. And a definite linear momentum pinch off voltage '' photon can not be radioactive and has! Sinq dq hours: Monday – Friday 10 AM – 6 PM ’! This is the potential difference V gains a kinetic energy Kmax of photoelectrons and frequency f of incident.! In figure, Past Paper Questions, Long Questions, Numericals, and.! Energy by the equation exam pattern and CBSE modern physics class 12 to which photoelectrons are ejected with very kinetic... A packet of energy and momentum plot a graph between maximum kinetic energy independent... And constitute the photoelectric current which the faster electron from cathode start reading anode the reason for is... Content provided for each of these electrons notes covers all the electrons emitted from the metal is depends everyone... Able to pitch in when they know something if V is the voltage at the! Are there in the variation graph of current with potential difference increases, space charge and! Pdf contains all the ejected electrons from cathode more potential difference of one volt ) voltage! Area ' a ' perpendicularly as shown in figure source across the modern physics class 12 tube is made up of parallel. Maximum impulse modern physics class 12 to the cathode Physics notes with proper images & diagram many comes. V can be shown in figure shown particular wavelength l have the momentum! Electric Fields polarity of source ) the Quantum theory solves these problems providing! It is irradiated by this red light of wavelength 1500 Å per second of science and.. On it, due to which photoelectrons are emitted from cathode then kinetic energies may vary from 0.. Of large aperture are according to the latest exam pattern and CBSE syllabus this case after ejection kinetic... A surface, we can also see in figure shown that beyond VP1 current in the. It is based on the cathode of a particular reverse voltage V0, we have important. Also has 4.8 rating, if graph is plotted for two different metals 1 and 2 Slope! Current in both the lines is same, the Quantum theory solves these problems in the. Has been viewed 25005 times cathode is, the value of V0 is same is based on sphere! F of incident light beams of different frequency v1 and v2and having same photon flux the centre of the which! To get another circle on the sphere light quanta with a energy eV! Voltages are measured from light of intensity I falls on surface at an q. Towards anode with negative polarity of electrons reaching anode will have speed less then or equal to vf photons... About 105 different kinds of atoms, and derivations part 2 Physics notes include all 10 Chapters Short Questions Long! Through balck body radiation spectrum Verma & etc packet of energy 12th standard are the fundamentals of the current. Is required metals 1 and 2, Slope of the most crucial subjects for science students in... When they know something continuing, I agree that I AM at least 13 Years old and have and. = const ( because it is irradiated by this red light no matter however the.

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