When a mono-chromatic point source of light is at a distance r from a photoelectric cell, the cut-off voltage is V and the saturation current is $I$ . If the same source is placed at a distance 3r away from the photoelectric cell, then

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the saturation current will not change

the saturation current will change to $\frac{I}{9}$

the stopping potential will change $\frac{V}{9}$

the stopping potential will increase to 3V

answer is B.

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Detailed Solution

When the distance is increased, frequency of incident light do not change and hence, the stopping potential does not change. But the intensity and hence the saturation current decrease nine times.

$I \propto \frac{1}{r^{2}}$

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