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MHT CET202019 Oct 2020Morning ShiftPhysicsDual Nature of MatterActual

The threshold wavelengths for photoelectric emission from two metals A and B are 400 ~nm and 800 ~nm respectively. The ratio of their work functions, _ A to ? is

Options

  1. A1 2
  2. B4
  3. C1 4
  4. D2

Correct answer

D. 2

Step-by-step solution

(D) work function = h c ₀ _ B _ A = _ B _ A = 800 400 =2

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