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Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying 0 . 5 V , when the radiation of 250 nm is used. The work function of the metal is

Options

  1. A4   eV
  2. B5 . 5   eV
  3. C4 . 5   eV
  4. D5   eV

Correct answer

C. 4 . 5   eV

Step-by-step solution

λ = 250   nm = 2500   A   E = hc λ = 12400 2500 = 4 .96   eV KE = e × stopping   potential = 0 .5   eV E = W 0 + KE 4 .96 = W o   +   0 .5 W 0 = 4 .46 ≈ 4 .5   eV

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