A photocell is illuminated by a small bright source places `1` m away when the same source of light is placed `(1)/(2)` m away. The number of electron emitted by photocathode would be

Options

A. Decrease by a factor of `2`
B. Increase by a factor of `2`
C. Decrease by a factor of `4`
D. Increase by a factor of `4`

Answer

D

Explanation

Number of photoelectrons `prop (1)/(( Distance)^(2))`.