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Sodium and copper have work functions 2.3 eV and 4.5 eV respectively. Then the ratio of the wave lengths is nearest to

Options

  1. A1 : 2
  2. B4 : 1
  3. C2 : 1
  4. D1 : 4

Correct answer

C. 2 : 1

Step-by-step solution

hc / ₀= W ₀ ; ( ₀ )₁ ( ₀ )₂ = ( W ₀ )₂ ( ~W ₀ )₁ = 4.5 2.3 =2: 1

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