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Question

# When a point source of monochromatic light is at a distance of 0.2m from a photoelectric cell, the cut-off voltage and the saturation current are 0.6 volt and 18 mA respectively. If the same source is placed 0.6 away from the photoelectric cell, then

A
The stopping potential will be 0.2 V
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B
The stopping potential will be 0.6 V
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C
The saturation current will be 6 mA
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D
The saturation current will be 18 mA
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Solution

## The correct option is B The stopping potential will be 0.6 VPhotoelectric current (i) ∝ Intensity ∝1(distance)2. If distance becomes 0.6 m (i.e. three times) so current becomes 19 times i.e. 2mA. Also stopping potential is independent of intensity i.e. it remains 0.6 V.

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