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MHT CET202015 Oct 2020Evening ShiftPhysicsDual Nature of MatterActual

When a photosensitive surface is irradiated by lights of wavelengths ₁ and ₂ , kinetic energies of emitted photoelectrons are E ₁ and E ₂ respectively. The work function of the photosensitive surface is

Options

  1. A₂ E₂- ₁ E₁ ₂- ₁
  2. B₁ E₁+ ₂ E₂ ₂+ ₁
  3. C₁ E₁- ₂ E₂ ₂- ₁
  4. D₂ E₁+ ₂ E₂ ₂- ₁

Correct answer

C. ₁ E₁- ₂ E₂ ₂- ₁

Step-by-step solution

Using photoclutic effect ( h c₁ ₁ = +k₁-(D) ) ...(i) and ( h₁ r₂ = k k₂ ) ...(ii) form (i) and (i) ( h n₁ ₁ h₂ ₂ = ( ) an +k₁ ) ( 1 d₁ d₂ 1 = +k₁ +k₂ ) ( d₂ n₁ = +4 +b₂ ) ( ₂ +k₂ d₂= ₁ +d₁ k₁ ) ( d₂ - ₁ = ₁ k₁-k₂ d₂ ) ( = d₁ k₁-k₂ d₂ d₂-d₁ )

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