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When a monochromatic point source of lig...

When a monochromatic point source of light is at a distance of `0.2` m from a photoelectric cell, the cut off voltage and the saturation current are respectively `0.6V` and `18.0 mA` if the same source is placed `0.6 m` away from the photoelectric cell , then

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

Text Solution

Verified by Experts

The correct Answer is:
B
Intensity `prop ` current `prop 1/(("distance")^2)`
And cut off voltage is independent of distance current `=18/9 =2mA`
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