Question

Write Einstein's Photoelectric equation and mention which important features in photoelectric effect can be explained with the help of this equation.

The maximum kinetic energy of the photo-electrons gets doubled when the wavelength of light incident on the surface changes from λ₁ to λ₂ . Derive the expressions for the threshold wavelength λ₀ and work function for the metal surface.

Answer 1

Important features :

(i) K_max depends linearly on frequency v.

(ii) Existence of threshold for the metal surface.

From (i) and (ii)

Work function