Define Stopping Potential (Cut-Off Potential) with Reference to the Photoelectric Effect

Answer: The stopping potential is the potential that must be present in order to prevent the removal of electrons from the metal when the energy of the incoming light is larger than the work potential of the metal.

The stopping potential is independent of incoming radiation intensity. As the intensity rises, the value of the saturated current rises, but the stopping potential stays the same.

For a given radiation intensity, the stopping potential is frequency-dependent. The higher the incident light frequency, the greater the stopping potential.