A photoelectric surface is illuminated successively by monochromatic light of wavelengths λ a n d 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 is :

Question

A photoelectric surface is illuminated successively by monochromatic light of wavelengths λ a n d 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 is :, h c 2 λ, h c λ, h c 3 λ, 3 h c λ

MARKS App · Accepted Answer

K . E λ = h c λ - ϕ K . E λ 2 = h c λ 2 - ϕ K . E λ 2 = 3 K . E λ ⇒ ϕ = h c 2 λ

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