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A photocell is illuminated by a small bright source placed $1 \mathrm{~m}$ away. When the same source of light is placed $\frac{1}{2} \mathrm{~m}$ away, the number of electrons emitted by photo cathode would
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increase by a factor of 4
increase by a factor of 4
$I \propto \frac{1}{r^2}$
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