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 0.2 V
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, so intensity (I) becomes I9. Hence photo current also decreases by this factor i.e., it becomes
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