Monochromatic light is incident on a metal surface,and the ejected electrons give rise to a current in the circuit shown in the figure.The maximum kinetic energy of the ejected electrons is determined by applying a reverse ('stopping')potential,sufficient to reduce the current in the ammeter to zero.If the intensity of the incident light is increased,how will the required stopping potential change?

Question

Quizplus · Accepted Answer

The stopping potential depends only on the frequency (or wavelength) of the incident light, and not on its intensity. Increasing the intensity of the light will simply increase the number of electrons ejected per unit time, but will not affect their maximum kinetic energy. Therefore, the stopping potential required to stop the ejected electrons will remain unchanged.

Monochromatic Light Is Incident on a Metal Surface,and the Ejected