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MHT CET202020 Oct 2020Evening ShiftPhysicsDual Nature of MatterActual

Photoelectrons are emitted from a photosensitive surface for the light of wavelengths ₁=360 ~nm and ₂=600 ~nm . What is the ratio of work functions for lights of wavelength ^ ₁ ^ to ₂ ^ ?

Options

  1. A6: 1
  2. B1: 6
  3. C5: 3
  4. D3: 5

Correct answer

C. 5: 3

Step-by-step solution

h c ₁ - ₁= KE ₁=360 ~nm =360 10⁻⁹ ~m hc ₂ - ₂= KE ₂=600 ~nm =600 10⁻⁹ ~m h c ₁ = ₁ 1 ₁ ₂ = ₂ ₁ = 600 360 = 10 6 = 5 3

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