Monochromatic light is incident on a metal surface.The ejected electrons give rise to a current in the circuit shown.The maximum 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

Monochromatic light is incident on a metal surface.The ejected electrons give rise to a current in the circuit shown.The maximum 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?

Quizplus · Accepted Answer

The stopping potential is determined by the maximum energy of the ejected electrons. Increasing the intensity of the incident light will only increase the number of electrons ejected, but not their maximum energy. Therefore, the stopping potential will remain unchanged.

Monochromatic Light Is Incident on a Metal Surface