Physics MCQs for Class 12 with Answers Chapter 11 Dual ... Hint Understand the general photoelectric experiment performed by Rudolf hertz and the model proposed by Albert Einstein. The photoelectric effect equation can be written as eV s = hf - W Important Questions for Class 12 Physics Chapter 11 Dual ... 15 Multiple Choice Questions:Photon and Photoelectric Effect But some of them with high kinetic energy are still able to reach the plate. Reason: The maximum kinetic energy of the photoelectrons is proportional to stopping potential. o. Collector Voltage and Stopping Potential . Posted Date:-2021-12-08 05:33:26. The Stopping Potential depends on the incident photon intensity. The stopping potential V 0 for photoelectric emission from a metal surface is plotted along y-axis and frequency v of incident light along x-axis. This process is also often referred to as photoemission, and the electrons that are ejected from the metal are called photoelectrons. In photoelectric effect, stopping potential depends upon The potential at which this occurs is called the stopping potential. Saturation current depends on the intensity of light incident. More and more are turned away as the voltage becomes more negative. 11) The retarding potential required to stop the emission of photoelectrons when a photosensitive material of work function 1.2 ev is irradiated with ultraviolet rays of wave length 2000 ALI. This equation, due to Einstein in 1905, explains the properties of the photoelectric effect quantitatively. Photoelectrons stopping potential depends on. Photoelectrons stopping potential depends on. d)The Stopping Potential depends on the incident photon wavelength. Photoelectrons stopping potential depends on (A) Frequency of incident light and nature of the cathode material (B) The intensity of the incident light (C) The frequency of the incident light (D) Nature of cathode material. Question Bank for JEE Main & Advanced Physics Photo ... (B) Intensity of incident light. The intensity of the incident light c. The frequency of the incident light d. Nature of cathode material. Photoelectrons stopping potential depends on a. /**/ The photons arriving at the metal plate cause photoelectrons to be emitted. The photodiode tube and its associated electronics have a small capacitance which becomes charged by the photoelectric current. It is subjected to radiation of frequency 9.00×10 14 hz. Stopping potential depends upon. The emission of free electrons from a metal surface when the light is incident on it is called the photoemission or the photoelectric effect. a)1.66e.V b)1.32 e.V . a potential of 7.7 V is required to stop the photoelectrons from reaching t. asked Mar 20, 2020 in Physics by . When the intensity is doubled the saturation current will also become two fold. Quiz 2172020 Modern Physics 413.pdf - Quiz 2172020 Modern ... A photon is an elementary particle. In the photoelectric effect, why is the kinetic energy of ... What is Work function , Threshold frequency & Stopping ... PDF assessment id-124 - NPTEL In aluminum 4.2 eV are required to remove an electron. Answer: (a) Frequency of incident light and nature of the cathode material Click here to go to stopping potential. The stopping potential in an experiment on photoelectric effect is 1.5 V. What is the maximum kinetic energy of the photoelectrons emitted? If a stopping potential of 1.30 V is required, what is the wavelength of the incoming monochromatic light? The stopping potential depends on frequency of incident light and the nature of the emitter material, For a given frequency of incident light, it is independent of its intensity Questions from Dual Nature of Radiation and Matter The momentum and energy . We can then assume that the max KE of the photoelectrons, K max = e. V ∘. Depends on both the frequency of the incident light and nature of the cathode material. The correct option is C. Since, the emitted electrons from a metal surface have an energy distribution, the minimum energy in this distribution being zero, the energy of slowest photoelectrons is also zero. The anode and cathode are enclosed in an evacuated glass tube. Stopping potential is defined as the minimum negative potential gradient of the plates at which the photoelectric current becomes zero. Stopping potential will be same for the same frequency. Above the threshold frequency, the maximum kinetic energy of the emitted photoelectrons depends on the frequency of the incident light, but is independent of the intensity of the incident light so long as the letter is not too high. Frequency of incident light and nature of the cathode material b. This effect led to the conclusion that light is made up of packets or quantum of energy called Photons. The energy quantization of electromagnetic radiation in general, and of light in particular, is expressed in the famous relation. Next step: if the electrons now reach a collecting plate, a current can be detected. Red light incident on a metal surface produces photoelectrons. This gives us the expression for the kinetic energy of photoelectrons, which explicitly depends on the frequency of . If the light is below than a certain frequency, no matter how intense , electrons will not be emitted. 6. Given: Stopping potential = V s = 3 V, work . Stopping potential is defined as the voltage difference that . 3.Photoelectrons stopping potential depends on. where E is the energy of the radiation, f is its frequency, and h is Planck's constant (6.63×10 -34 Js). low work function ˚. Home Data Structure Singly Linked List Data Structure in C Circular Linked List in data Structure Doubly Linked List in data structure Array Data structure String Data structure Stack Implementation by array Stack implementation by Linked list Linear Queue Implemented by Array Queue . Assertion: Stopping potential depends upon the frequency of incident light but is independent of the intensity of the light. The stopping potential is defined as the potential necessary to stop any electron (or, in other words, to stop even the electron with the most kinetic energy) from 'reaching the other side'. Click here to read about the photoelectric effect experiment and a bit of history of its discovery.. Click here to go to a page of videoclip explanations. When the potential difference across the tube is increased , the Photo current increases and finally reaches a maximum value (Is) which depends on the intensity of light . 5. The photodiode tube and its associated electronics have a small capacitance which becomes charged by the photoelectric current. . Maximum kinetic energy of the photoelectrons would be `K_("max")=E-W=(5-3) eV=2eV` Therefore, the stopping potential is `2V`. What Lenard found was that the intensity of the incident light had no effect on the maximum kinetic energy of the photoelectrons. The photoelectric effect is the emission of electrons by substances, especially metals, when light falls on their surfaces. II. At wavelengths that do cause the photoelectric effect, current does depend on intensity. When the potential on this capacitance reaches the stopping potential of the photoelectrons, the current decreases to zero, and the . If both assertion and reason are true and reason is the correct explanation of assertion . The energy of the electrons would depend on the intensity of the wave and not the frequency. Answer. Score: 0 Accepted Answers: 12) The energy of an electron in excited hydrogen atom is -3.4 eV. Find the maximum kinetic energy of the photoelectrons emitted when light of frequency 1.5 x 10^15 Hz is directed on a Copper surface. Here v max is the maximum speed of the most energetic photoelectrons. Stopping potential for photoelectrons [MP PET 1994] A) . What is the cut off frequency of sodium? Furthermore if an external retarding potential is placed between the metallic surface and the collecting electrode, the current can be reduced, because at high enough potentials, even the fastest electrons will be prevented from reaching the collector. . It is concluded from the graph that, the maximum kinetic energy of the photoelectrons varies . Stopping potential for photoelectrons. Click here to go to the graph. . Medium. Photoelectrons stopping potential depends on. the release of photoelectrons by photons with an energy (E=hf) above the work function. Answer. A straight line is obtained as shown. So its curves 'a' and 'b' which have same frequency but different intensities. B) Both A and B are . 4.Nature of cathode material. Stopping potentials experiment. The intensity of the incident light c. The frequency of the incident light d. Nature of cathode material. (All India 2008) Answer: Planck's constant is given by [CPMT 1987; Similar to MP PMT 2000; Kerala PET 2001] Part 2: Intensity Dependence According to the quantum model of light, the maximum kinetic energy, Question: Photoelectrons stopping potential depends on Q. The intensity of incident light C. The frequency of incident light D. Nature of cathode material ANSWER: A. (I 2 > I 3) Question 4. Q3. Answer. The stopping potential is found to be V. If the distance of the light source is reduced to d/n (where n>1), explain the changes that are likely to be observed in the (i) photoelectric current and (ii) stopping potential. Q3. Frequency of incident light and nature of cathode material B. The threshold or cut-off frequency for sodium is 4,40×10 14 hz. This process of interaction usually occurs between photons and electrons of inner shells. Plot a graph showing the variation of stopping potential with the frequency of incident radiation for two different photosensitive materials having work functions W 1 and W2 (W 1 >W 2).On what factors does the (i) slope and (ii) intercept of the lines depend? Stopping potential for photoelectrons (1) Does not depend on the frequency of the incident light (2) Does not depend upon the nature of the cathode material (3) Depends on both the frequency of the incident light and nature of the cathode material (4) Depends upon the intensity of the incident light. 1.Frequency of incident light and nature of the cathode material. Photoelectrons ejected from the cathode collect on the anode. Answer: (A) Frequency of incident light and nature of the cathode material. This flow of electrons across the gap sets up an emf between the plates that causes a current to flow around the rest of the circuit. The threshold frequency depends on the material being illuminated. Does not depend upon the nature of the cathode material. The stopping potential . Light of a wavelength 2000 falls on an aluminum surface. The plate is called the "emitter". Nature of cathode material. Ans: The stopping potential is 2.54 V. When radiation of certain wavelength shines on the cathode of the photoelectric cell, the photocurrent produced can be reduced to zero by applying stopping potential of 3 V. If the work function of the photo emitter is 3.63 eV, find the frequency of radiation. The stopping potential is the voltage between the metal surface and a cathode, placed close to the surface, in a vacuum, which just stops them from producing a current. [EAMCET (Engg.) A monochromatic radiation of wavelength 975 Å excites the hydrogen atom from its ground state to a higher state. A light beam is shining on a metal target that has a work function of 2.20 eV. Stopping potential depend upon frequency of incident light. Photoelectric Current Set up this circuit. Electron: It is an elementary particle having a negative charge of 1.60217662 × 10-19 coulombs and mass 9.10938356 × 10-31 kilograms . The results are shown on the graph. An experimental setup to study the photoelectric effect. At stopping potential photoelectric current drops to zero. Planck's constant is given by Does not depend on the frequency of the incident light. EQ - Explain why excited atoms only emit certain frequencies of radiation . A. the corresponding graphs are shown in figure. (C) Number of emitted electrons. So its curves 'a' and 'b' which have same frequency but different intensities. Solution. . Photoelectrons stopping potential depends on (a) Frequency of incident light and nature of the cathode material (b) The intensity of the incident light (c) The frequency of the incident light (d) Nature of cathode material. Question: Photoelectrons stopping potential depends on: The intensity of the incident light. Stopping potential: It is the minimum negative (retarding) potential, given to the anode (collector plate) for which the photocurrent stops or becomes zero. 29.Write Einstein's photoelectric equation in terms of the stopping potential and the threshold frequency for a given photosensitive material. The minimum energy required to remove an electron is called a. Answer (1 of 40): Photoelectric effect was first explained bty Einstein. cathode, at which no photoelectron reaches the plate is called stopping potential. This potential is called the stopping potential. The . Frequency of incident light and nature of cathode material B. Q3- Photoelectrons stopping potential depends on a. In terms of their behavior and their properties, photoelectrons are no . Does not depend on the frequency of the incident light. A straight line is obtained as shown. (I 2 > I 3) Q.2] The stopping potential in an experiment on photoelectric effect is 1.5 V. What is the maximum kinetic energy of the photoelectrons emitted? where V ∘ is the stopping potential. When proper positive potential is applied to collector C, all the photoelectrons are attracted towards it and the maximum current recorded by the micro-ammeter gives an idea of the number of photo electrons.When negative potential is applied to the collector, . From the graph, it is found that higher the frequency of the incident radiation, higher is the value of stopping potential Vo. Complete answer: Given, the maximum kinetic energy: K max = 4 . But the stopping potential does depend on the kinetic energy of the electrons. Photoelectrons stopping potential depends on: The intensity of the incident light. of the electron e- = 1.5 eV 2.The intensity of the incident light. Consequently, more loosely bound outer shell electrons can fill the inner shell leading to the emission of x-rays. Depends upon the intensity of the incident light. Depends upon the intensity of the incident light. The sketch graph shows how the stopping potential \({V_s}\) varies with frequency \(f\). Depends on both the frequency of the incident light and nature of the cathode material. Answer (1 of 8): Photoelectrons are emitted from a metal, when illuminated with light, above the threshold frequency of the metal, with a range of KE's. The stopping potential is the voltage between the metal surface and a cathode, placed close to the surface, in a vacuum, which just stops them f. When the a) Frequency of incident light and nature of the cathode material b) The intensity of the incident light c) The frequency of the incident light d) Nature of cathode material Stopping Potential. Those electrons that cross the gap are collected at the other metal plate - called "the collector". Photoelectrons stopping potential depends on (a) Frequency of incident light and nature of the cathode material (b) The intensity of the incident light (c) The frequency of the incident light (d) Nature of cathode material. EQ - define stopping potential. $\begingroup$ He says that the photoelectrons require energy to get into . The final, stable voltage value on the voltmeter is the stopping potential for that wavelength of light. Q4- What is the value of the maximum KE energy acquired by electron due to radiation of wavelength 100 nm? Physics MCQs for Class 11 With Answers Pdf Question 5. If the power supply is wired such that it makes the collector negative, then it's harder for ejected electrons to bridge the gap. Experiment 6 - The Photoelectric Effect. The stopping potential is related to the maximum kinetic energy of the ejected photoelectrons. The photoelectric effect is the process of a photon being absorbed by an atom ejecting an electron. 22. Overview of Stopping Potential In case of stopping potential, the value of retarding potential difference between two plates is sufficient to stop the most energetic photoelectrons emitted. 497 nm C. 744 nm D. 1421 nm E. 1812 nm 4.The stopping potential value is 0.6 V when the light source is kept at a distance of 20 cm. 3.The frequency of the incident light. Stopping potential will be same for the same frequency. a) Frequency of incident light and nature of the cathode material b) The intensity of the incident light c) The frequency of the incident light d) Nature of cathode material 5. If V º is the stopping potential, then this potential difference multiplied by the electric charge gives the kinetic energy of the most energetic photoelectrons. where [latex]\boldsymbol{\textbf{KE}_e}[/latex] is the maximum kinetic energy of the ejected electron, [latex]\boldsymbol{hf}[/latex] is the photon's energy, and BE is the binding energy of the electron to the particular material. . The intensity of incident light C. The frequency of incident light D. Nature of cathode material ANSWER: A The stopping potential value is 0.6 V when the light source is kept at a distance of 20 cm. Light of wavelength 469 nm shines on the cathode and causes electrons to be ejected from the sodium metal. a. 5. Stopping potential at threshold frequency is zero and the stopping potential varies directly with the frequency of incident radiation. The potential V of the supply is varied and the current is measured. Photoelectrons stopping potential depends on _____. The maximum kinetic energy of a stream of photoelectrons (K max)…is determined by measuring the stopping potential (V 0) the applied voltage needed keep the photoelectrons trapped in the photoemissive surface . A. When the potential on this capacitance reaches the stopping potential of the photoelectrons, the current decreases to zero, and the . 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