Photoelectric Effect

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Photoelectric Effect: Overview

This topic covers concepts such as Threshold Wavelength for Photoelectric Effect, Stopping Potential for Photoelectrons, Relation between Stopping Potential and Maximum Kinetic Energy of Photoelectrons, etc.

Important Questions on Photoelectric Effect

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The stopping potential in an experiment on photoelectric effect is 1.5 V. The maximum kinetic energy of the photoelectron emitted would be:

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The stopping potential in an experiment on the photoelectric effect is 1.5 V. The maximum kinetic energy of the photoelectron emitted would be

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The stopping potential in an experiment on the photoelectric effect is 2 V. The maximum kinetic energy of the photoelectrons emitted would be

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The maximum kinetic energy of a photoelectron is 3 eV. Its stopping potential is:

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The Einstein’s photoelectric equation is:

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The Einstein’s photoelectric equation is:

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The following graph shows the variation of stopping potential V 0 with frequency ν of the incident radiation for two photosensitive metals P and Q.

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Which metal has

(i) a smaller threshold wavelength?

(ii) smaller kinetic energy?

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The following graph shows the variation of stopping potential  V0  with the frequency  v  of the incident radiation for two photosensitive metals X and Y:

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(i) Which of the metals has larger threshold wavelength? Give reason.

(ii) Explain, giving reason, which metal gives out electrons, having larger kinetic energy, for the same wavelength of the incident radiation.

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The graph between frequency of incident radiations and stopping potential for a given photosensitive material is as follows.

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What information can be obtained from the value of the intercept on the potential axis?

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The graph between frequency of incident radiations and stopping potential for a given photosensitive material is as follows.

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What information can be obtained from the value of the intercept on the potential axis?

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Show graphically how the stopping potential for a given photosensitive surface varies with the frequency of the incident radiation.

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In the photo-electron emission, the energy of the emitted electron is

                                                                                                                                                                                                                               

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The maximum kinetic energy of electrons emitted in the photoelectric effect is linearly dependent on the________________ of the incident radiation.

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Stopping potential in the experimental setup shown in the figure is

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When two monochromatic lights of frequency ν and ν2 are incident on a photoelectric metal their stopping potential becomes Vs2 and Vs respectively. The threshold frequency for this metal is:

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How do you do the photoelectric effect experiment?

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Draw a plot showing the variation of photoelectric current with collector plate potential foe two different frequencies, v1 > v2,  of incident radiation having the same intensity. In which case will the stopping potential be higher ?

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How does the photoelectric current vary with intensity of incident radiation?

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How is photoelectric current affected on increasing frequency?

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What is the effect of potential on photoelectric current?