A photoelectric surface is illuminated successively by monochromatic light of wavelength $\lambda$ and $\dfrac{\lambda}{2}$ . 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

\lambda

and

\dfrac{\lambda}{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)

Quantrex Academy · Accepted Answer

Correct answer: D. (hc)/(2λ)

k _ 1 = (hc)/(λ) - ψ k _ 2 = 3 k _ 1 = (2hc)/(λ) - ψ = (3hc)/(λ) - 3ψ So 2ψ = (hc)/(λ) So ψ = (hc)/(2λ)

A photoelectric surface is illuminated successively by...

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