Question

In a photoelectric effect experiment, light of a single wavelength is incident on the metal surface. As the intensity of the incident light is increased, (a) the stopping potential increases (b) the stopping potential decreases. (c) the work function increases (d) the work function decreases (e) none of the above.

Answer 1

option (e)

Step-by-step explanation:

When the light of some threshold frequency falls on the metal surface, the photo electrons are ejected from the surface. The energy corresponds to the threshold frequency is called the work function of the metal.

When the intensity of the incident light falling on the metal surface increases, the number of photo electrons increases and hence the amount of photo electric current increases.

The work function is the characteristic of metal surface, it does not depend on the intensity.

Stopping potential is the negative potential given to the anode plate so that not a single electron reach at the anode plate, so it does not depend on the intensity of light falling on the metal surface.

There is no effect on the value of stopping potential or the work function, so the option (e) is correct.