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If photocell is illuminated by a small bright source placed 1 m away emits certain number of electrons. Determine number of electrons emitted by photocathode when the same source of light is placed (1/2) m away

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decrease by a factor of 2

increase by a factor of 2

decrease by a factor of 4

increase by a factor of 4

answer is D.

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Detailed Solution

As $I \propto \frac{1}{r^{2}} ∴ I^{'} \propto \frac{1}{(1 / 2)^{2}} or I \propto 4$

i.e., intensity will become four times, therefore number of photons will become 4 times.

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