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Question

When monochromatic light falls on a photosensitive material, the number of photoelectrons emitted per second is n and their maximum kinetic energy is Kmax. If the intensity of the incident light is doubled, then

A
Both n and Kmax are doubled.
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B
Both n and Kmax are halved.
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C
n is doubled but Kmax remains the same.
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D
Kmax is doubled but n remains the same.
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Solution

The correct option is C n is doubled but Kmax remains the same.

Intensity is proportional to the number of photons released per second, and frequency decides the energy of each of the photon. Hence, as the intensity increases, the number of photons increases, and as a result, the number of electrons also increases. However, since the energy of the photon and the work function are same, Kmax remains the same.
Hence, the correct choice is (c).

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