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Q.

When a point source of monochromatic light is at a distance of 0.2 m 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 m away from the photoelectric cell, then

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a

The stopping potential will be 0.2V

b

The stopping potential will be 0.6 V

c

The saturation current will be 6 mA

d

The saturation current will be 18 mA

answer is B.

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Detailed Solution

Cut-off voltage is independent of intensity and hence, remains the same. Since distance becomes 3 times, intensity (I) becomes I9. Hence, photocurent also decreases by this factor i.e., becomes 189=2mA.
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When a point source of monochromatic light is at a distance of 0.2 m 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 m away from the photoelectric cell, then