Question

For a given photosensitive material, how does stopping potential change when the frequency of incident radiation increases?

Options

• It becomes the saturation current.

• It depends only on intensity.

• It increases.

• It decreases.

Answer 1

For a given photosensitive material, stopping potential increases with incident-radiation frequency. Higher frequency gives emitted photoelectrons greater maximum kinetic energy, requiring a larger negative potential to stop them.