Question

in photoelectric effect, why should the photoelectric current increase as the intensity of monochromatic radiation incident on a photosensitive surface is increased? Explain.

Answer 1

Intensity is a measure of no of photons in unit area .
More intensity → more photons→ more collisions → ejection of more electrons →increase in current .

Answer 2

The photoelectric current increases as the intensity of monochromatic radiation is increased on a photosensitive surface due to the increased emission of photo electrons.

• As light shines on a metal it is possible to expel electrons from the metal surface in a phenomenon known as the photoelectric effect.
• A change in incident radiation rate leads to an increase in the number of incident photons resulting in an increase in the amount of emitted photo electrons.