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Question

A caesium photocell, with a steady potential difference of 60V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1m away the photoelectrons emitted from the cell


A

Are one quarter as numerous

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B

Are half as numerous

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C

Each carry one quarter of their previous momentum

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D

Each carry one quarter of their previous energy

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Solution

The correct option is A

Are one quarter as numerous


Number of photo electrons
(N)Intensity1d2N1N2=(d2d1)2
N1N2=(10050)2=41N2=N14


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