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Question

A cesium photocell, with a steady potential difference of 60 V across it, is illuminated by a small bright light placed 1 m away. When the same light is placed 2 m away, the electrons crossing the photocell.

A
each carry one-quarter of their previous momentum
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B
each carry one-quarter of their previous energy
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C
are one-quarter as numerous
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D
are half as numerous
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Solution

The correct option is C are one-quarter as numerous
Number of Photo electrons (N)
AsI1d2
We get I2I1=(1)2(2)2=14

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