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JEE Main202125 Jul 2021Morning ShiftPhysicsDual Nature of MatterActual

What should be the order of arrangement of de-Broglie wavelength of electron λ e , an α -particle λ α and proton λ p given that all have the same kinetic energy ?

Options

  1. Aλ e = λ p = λ α
  2. Bλ e < λ p < λ α
  3. Cλ e > λ p > λ α
  4. Dλ e = λ p > λ α

Correct answer

C. λ e > λ p > λ α

Step-by-step solution

λ = h p = h 2 m E ∝ 1 m m α > m p > m e so λ e > λ p > λ α

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