A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be V0. If the distance between the light source and photo cell is made 25 cm, the new stopping potential will be :

By changing the position of source of light from photocell, there will be a change in the intensity of light falling on photocell.As stopping potential is independent of the intensity of the incident light, hence stopping potential remains samei.e., V0.