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

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:
  1. 0
  2. 2 m2c2λ2 h2
  3. 2mcλ2 h
  4. hcmc

Solution

λ=hmv

Kinetic energy, P22 m=h22 mλ2=hcλc

λc=2 mλ2ch

Asked in: JEE Main 2021 (20 Jul Shift 2)

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