Question

Calculate the kinetic energy of a photoelectron (ineV) emitted on shinning light of wavelength 6.2 x 10^-6 m on metal surface. Work function of the metal is 3.1 eV​

Answer 1

Answer:

Kinetic energy = hv - ϕ0 = hc/λ - ϕ0

λ = 6.2 x 10^-6 m

ϕ = 0.1 eV

= 0.1 x 1.6 x 10^-19 J

∴ Kinetic energy, = {6.6 x 10^-34 Js x 3 x 10^8 m/s}/{6.2 x 10^-6}

= 3.2 x 10^-20 J - 1.6 x 10^-20 J

= (3.2 - 1.6) x 10^-20 J = 1.6 x 10^-20 J

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