1.
When a monochromatic point-source of light is at a distance of 0.2m0.2\,\text{m} from a small photoelectric cell, the stopping potential and the saturation current are respectively 0.6V0.6\,\text{V} and 18.0mA18.0\,\text{mA}. If the same source is placed 0.6m0.6\,\text{m} away from the photoelectric cell, then