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(D) For a point source of light,the intensity $(I)$ of light incident on the emitter surface is inversely proportional to the square of the distance $

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$d$

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(D) For a point source of light,the intensity $(I)$ of light incident on the emitter surface is inversely proportional to the square of the distance $(d)$ from the source,i.e.,$I \propto \frac{1}{d^2}$.According to the photoelectric effect,the photocurrent $(i)$ is directly proportional to the intensity $(I)$ of the incident light,i.e.,$i \propto I$.Combining these two relations,we get $i \propto \frac{1}{d^2}$.This represents a rectangular hyperbola-like curve where the photocurrent decreases rapidly as the distance increases. Among the given options,curve $d$ best represents this inverse square relationship.

$A$ point source of light is used in an experiment on the photoelectric effect. Which of the following curves best represents the variation of photocurrent $(i)$ with distance $(d)$ of the source from the emitter?

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