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When a monochromatic 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
detailed solution
Correct option is B
When the distance is increased, frequency of incident light and hence the stopping potential does not change. But the intensity changes and hence the saturation current decreases nine times.
[ Intensity of incident radiation ]
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