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Question 600243
JEE Chemistry · Hard

Atomic Structure: Wave-particle MCQ

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Wave-particleHardQuestion 600243

Question

An electron and a proton have the same de Broglie wavelength. The ratio of their kinetic energies KE_e/KE_p is:
  1. A
    mp/me
    Correct
  2. B
    me/mp
  3. C
    1
  4. D
    (mp/me)²

Correct answer

mp/me

Explanation

Same λ → same momentum p. KE = p²/(2m). So KE_e/KE_p = mp/me ≈ 1836.

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