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Photoelectric Effect

Kinetic energ...

Question

Kinetic energy of photo electrons increases with:

A

increase in intensity of incident light

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B

increase in wavelength of incident light

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C

decrease in frequency of incident light

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D

increase in frequency of incident light

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Solution

The correct option is D increase in frequency of incident light
Energy of radiation $= K . E + w o r k f u n c t i o n$
$E n e r g y ↑\Rightarrow K . E ↑$
$f r e q u e n c y ↑\Rightarrow K . E ↑$

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Q. Assertion :Kinetic energy of photoelectrons increases with increase in the frequency of incident radiation. Reason: The number of photoelectrons ejected increases with increase in intensity of incident radiation.

Q. Assertion :The kinetic energy of photo-electrons increases with increase in frequency of incident light where

v > v_{0}

. Reason: Whenever intensity of light is increased the number of photo-electron ejected always increases.

Read the above assertion and reason and choose the correct option regarding it.

Q. Statement- 1: The kinetic energy of photoelectrons increases with increase in frequency of incident light.

Statement- 2: The number of photoelectrons ejected increases with increase in intensity of light.

Q. Explain giving reasons for the following.
(a) Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation.
(b) The stopping potential

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(ν)

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Q. Assertion :The kinetic energy of the photoelectron ejected increases with increase in intensity of incident light. Reason: Increase in intensity of incident light increases the rate of emission.

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