question_answer

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

A)  stopping  potential \[{{V}_{0}}\text{=}0.2\]volt  and saturation current \[{{I}_{s}}=18.0\text{ }mA\]

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

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

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