A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be $V_0$. 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 same
i.e., $V_0$.