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when a monochromatic point source of lig...

when a monochromatic point source of light is at a distance 0.2 m from a photoelectric cell, the saturation current and cut-off voltage are 12.0 mA and 0.5 V. If the same source is placed 0.4 m away from the photoelectric cell, then the saturation current and the stopping potential respectively are

A

4mA and 1V

B

12mA and 1V

C

3mA and 0.5V

D

12mA and 0.5V

Text Solution

Verified by Experts

The correct Answer is:
C
`I prop1/(("distance")^2)implies I_1/I_2 = (d_2/d_1)^(2)=((0.4)/(0.2))^(2)`
`implies I_2=3mA`
Stopping potential is independent of distance.
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