A photoelectric surface is illuminated successively by monochromatic light of wavelength $λ$ and $\frac{λ}{2}$ . If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is:
( $h$ = Planck's constant, $c$ = speed of light)

Question

A photoelectric surface is illuminated successively by monochromatic light of wavelength

λ

and

\frac{λ}{2}

. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is:
(

h

= Planck's constant,

c

= speed of light)

Aicharya · Accepted Answer

k 1 = h c λ - ψ k 2 = 3 k 1 = 2 h c λ - ψ = 3 h c λ - 3 ψ So 2 ψ = h c λ So ψ = h c 2 λ

A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and λ 2 . If the…

Solution