A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 1 2 m away, the number of electrons emitted by photocathode would

Question

A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 1 2 m away, the number of electrons emitted by photocathode would, increase by a factor of 2, decrease by a factor of 2, increase by a factor of 4, decrease by a factor of 4

MARKS App · Accepted Answer

n ∝ I ∝ 1 r 2 ⇒ n 2 n 1 = r 1 r 2 2 = 1 1 2 2 = 4 ⇒ n 2 = 4 n 1

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