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A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are u 1 and u 2 , respectively. If the ratio u 1 : u 2 = 2 : 1 , the work function of the metal is nearly

Options

  1. A3.7 eV
  2. B3.2 eV
  3. C2.8 eV
  4. D2.5 eV

Correct answer

A. 3.7 eV

Step-by-step solution

h c λ 1 - ϕ h c λ 2 - ϕ = u 1 2 u 2 2 ϕ = 3.7 e V

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