question_answer

When a monochromatic point source of light is at a distance of 0.2 m from a photocell, the cut-off voltage and the saturation current are respectively \[{{V}_{0}}=0.6\]volt and Js = 18.0 mA. If the same source is placed 0.6 m away from the photocell, then :

A)  stopping potential \[{{V}_{0}}=~0.2\] volt and saturation current J, = 18.0 mA

B)  stopping potential \[{{V}_{0}}=0.6\] volt and saturation current Is = 18.0 mA

C)  stopping potential \[{{V}_{0}}=0.6\] volt and saturation current Is = 2.0 mA

D)  stopping potential \[{{V}_{0}}=2.0\] volt and saturation current Is = 2.0 mA