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JEE Main202120 Jul 2021Evening ShiftPhysicsDual Nature of MatterActual

An electron having de-Broglie wavelength λ is incident on a target in a X -ray tube. Cut-off wavelength of emitted X -ray is:

Options

  1. A0
  2. B2   m 2 c 2 λ 2   h 2
  3. C2 m c λ 2   h
  4. Dh c m c

Correct answer

C. 2 m c λ 2   h

Step-by-step solution

λ = h m v Kinetic energy, P 2 2   m = h 2 2   m λ 2 = h c λ c λ c = 2   m λ 2 c h

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