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NEET2011PhysicsDual Nature of MatterActual

Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speeds of emitted electrons will be

Options

  1. A1: 2
  2. B1: 1
  3. C1: 5
  4. D1: 4

Correct answer

A. 1: 2

Step-by-step solution

Kinetic energy KE = - ₀ Here, KE ₁=1-0.5=0.5 eV aligned & KE ₂=2.5-0.5=2 eV & KE ₁ KE ₂ = 0.5 2 = 1 4 & or y₁^2 y₂^2 = 1 4 & or y₁ y₂ = 1 4 = 1 2 aligned

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