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NTA Abhyas JEE Main2020ChemistryStructure of AtomPractice

If λ ο and λ be the threshold wavelength and wavelength of incident light, the velocity of photoelectron ejected from the metal surface is :

Options

  1. A2 h c m λ ο - λ λ λ ο
  2. B2 h c m λ ο - λ
  3. C2 h m λ ο - λ
  4. D2 h m 1 λ ο - 1 λ

Correct answer

A. 2 h c m λ ο - λ λ λ ο

Step-by-step solution

Einstein photo Electric Equation hν - hν 0 = 1 2 mV max 2 h C λ - h C λ 0 = 1 2 mV max 2 2 hC m 1 λ - 1 λ 0 = V max 2 V max = 2 hC m λ 0 - λ λ λ 0

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