A light source of wavelength λ illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV . If the same surface is illuminated by a light source of wavelength 2 λ , th

Question

A light source of wavelength λ illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV . If the same surface is illuminated by a light source of wavelength 2 λ ​ , then the maximum kinetic energy of ejected electrons will be (The work function of metal is 1 eV )

TestHub · Accepted Answer

Einstein's photoelectric equation ​ KE = λ h c ​ = ϕ 0 ​ 2 eV = λ h c ​ − 1 eV λ h c ​ = 3 eV KE ′ = ( λ /2 ) h c ​ − ϕ 0 ​ = 6 eV − 1 eV ​ = 5 eV

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