Question

Definition of threshold wavelength in photoelectric effect

Answer 1

Threshold wave length is the minimum frequency or maximum wavelength of incident radiation necessary to release photons from a given surface in the photo electric effect.

Answer 2

Threshold wavelength is described below :

It is defined as the most minimum wavelength that the light should possess to cause the photoelectric effect. If the wavelength of the light is under the threshold type of frequency, then photoelectric effect will not take place.

And so, photo electrons will also not be ejected from the surface of metals.

But if the light has wavelength greater from threshold wavelength, then electrons will get ejected.