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NEET2015PhysicsDual Nature of MatterActual

A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and 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)

Options

  1. Ah c λ
  2. B2 h c λ
  3. Ch c 3 λ
  4. Dh c 2 λ

Correct answer

D. h c 2 λ

Step-by-step solution

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

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