Question

47.When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and saturation current are 0.6 volt and 18 mA respectively. If the same source is placed 0.6 m away from photoelectric cell, then (1) Stopping potential will be 0.2 volt (2) Stopping potential will be 0.6 volt (3) The saturation current will be 6 mA (4) The saturation current will be 18 mA

Answer 1