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 0.6 V and 18 mA. If the same source is placed 0.6 m away from the photoelectric cell, then

Options

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

B

Explanation

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