The de Broglie wavelength associated with a particle of mass m and velocity v is
A{'text': 'λ = m v / h', 'label': 'A'}
B{'text': 'λ = h / (m v)', 'label': 'B'}
C{'text': 'λ = h v / m', 'label': 'C'}
D{'text': 'λ = h m v', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'λ = h / (m v)', 'label': 'B'}
1. de Broglie (1924) postulated wave-particle duality for matter.
2. Momentum p = m v; associated wavelength λ = h / p = h / (m v).
3. Confirmed for electrons by Davisson-Germer diffraction experiment.
4. h/(m v) is negligible for macroscopic objects but significant for electrons.
_Source: NCERT Class 11 Chemistry, Ch 2 "Structure of Atom", §2.6_
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