When a monochromatic source of light is at a distance of 0.2m from a photoelectric cell, the cut-off voltage and the saturation current are respectively 0.6 V and 18 m A. If the same source is placed 0.6 m a way from the cell, then :
(A) the stopping potential will be 0.2V
(B) the stopping potential will be 1.8V
(C) the saturation current will be 6.0mA
(D) the saturation current will be 2.0mA