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

Question

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

TestHub · Accepted Answer

I ∝ r 2 1 ​

Physics - Modern Physics Question with Solution | TestHub

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