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(B) The intensity $I$ of light from a point source follows the inverse square law,$I \propto \frac{1}{d^2}$,where $d$ is the distance from the source.

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Photoelectric current will decrease

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(B) The intensity $I$ of light from a point source follows the inverse square law,$I \propto \frac{1}{d^2}$,where $d$ is the distance from the source.When the distance $d$ is doubled,the intensity $I$ becomes $\frac{1}{4}$ of its original value.The photoelectric current is directly proportional to the intensity of incident light.Since the intensity decreases,the number of photons hitting the surface per unit time decreases,resulting in a decrease in the photoelectric current.Stopping potential and maximum kinetic energy depend on the frequency of the incident light,not on its intensity.Therefore,the correct result is that the photoelectric current will decrease.

$A$ point source of light is used in an experiment of photoelectric effect. If the distance between the source and the photoelectric surface is doubled,which of the following may result?

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