A point source causes the photoelectric effec | vedclass

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(D) The intensity of light from a point source at a distance $r$ is given by $I_{light} \propto \frac{1}{r^2}$.Since the saturation photocurrent is di

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(D) The intensity of light from a point source at a distance $r$ is given by $I_{light} \propto \frac{1}{r^2}$.Since the saturation photocurrent is directly proportional to the intensity of the incident light, we have $I \propto I_{light}$.Therefore, the saturation photocurrent $I$ is inversely proportional to the square of the distance $r$, i.e., $I \propto \frac{1}{r^2}$.This relationship is represented by a curve that decreases rapidly as $r$ increases, which corresponds to the shape shown in option $D$.

$A$ point source causes the photoelectric effect from a small metal plate. Which of the following curves may represent the saturation photocurrent $(I)$ as a function of the distance $(r)$ between the source and the metal?

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