A photoelectric cell is illuminated by a small bright source of light placed at 1m. If the same source of light is placed 2m away, the electrons emitted by the cathode

Question

$\begin{array}{1 1} \text{(a) each carries one quarter of its previous momentum.}\\ \text{(b) each carries one quarter of its previous energy.} \\ \text{ (c) are half the previous number.} \\ \text{(d) are one quarter of the previous number. }\end{array}$