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(D) The saturation photoelectric current $I_P$ is directly proportional to the number of photoelectrons emitted per unit time,which in turn is proport

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$D$

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(D) The saturation photoelectric current $I_P$ is directly proportional to the number of photoelectrons emitted per unit time,which in turn is proportional to the intensity of incident light.For a point source,the intensity $I$ of light at a distance $d$ from the source follows the inverse square law,i.e.,$I \propto \frac{1}{d^2}$.Since the saturation photoelectric current $I_P$ is proportional to the intensity of light falling on the metal plate,we have $I_P \propto I \propto \frac{1}{d^2}$.This relationship $I_P \propto \frac{1}{d^2}$ represents a curve that decreases rapidly as the distance $d$ increases,which corresponds to curve $D$ in the given graph.

Photoelectric effect is produced by a point source on a small metal plate. Which of the following curves represents the saturation photoelectric current as a function of the distance between the source and the metal?

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