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A point source of light is used in an experiment of photo-electric effects. If the distance between the source and the photo-electric surface is doubled, which of the following may result?
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Verified Answer
The correct answers are:
photo-electric current will decrease
Hint:
Intensity $\mathrm{I} \propto \frac{1}{\text { d }}$
and photo-electric current $\propto$ intensity
$\therefore$ Current will decrease
Intensity $\mathrm{I} \propto \frac{1}{\text { d }}$
and photo-electric current $\propto$ intensity
$\therefore$ Current will decrease
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