When a monochromatic point source of light is at a distance of `0.2` m from a photoelectron
Channel: Doubtnut
Date: 2020-07-05

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