Q.

If the intensity of radiation incident on a photocell be increased four times, then the number of photoelectrons and the energy of photoelectrons emitted respectively become

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a

four times, doubled

b

doubled, remains unchanged

c

remains unchanged, doubled

d

four times, remains unchanged

answer is D.

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Detailed Solution

Since the number of photoelectrons emitted is directly proportional to the intensity of incident radiation, the number of photoelectrons emitted becomes four times.The energy of photoelectrons does not change with the intensity light.
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If the intensity of radiation incident on a photocell be increased four times, then the number of photoelectrons and the energy of photoelectrons emitted respectively become