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NEET2010PhysicsDual Nature of MatterActual

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV , when ultraviolet light of 200 ~nm falls on it, must be

Options

  1. A2.4 ~V
  2. B-1.2 ~V
  3. C-2.4 ~V
  4. D1.2 ~V

Correct answer

D. 1.2 ~V

Step-by-step solution

Energy of incident light E ( eV )= 12375 2000 =6.2 eV (200 ~nm =2000 Å) According to the relation E = W ₀+ eV ₀ aligned V ₀ & = E - W ₀ e & = (6.2-5.01) e e & =1.2 ~V aligned

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