QUESTION 24 For a diatomic linear chain, the phonon dispersion relation (k) has two branches corresponding to + and-sign respectively: 2 w(K) = f (M₂₁ + M₂) ± ƒ [(M₂ ²+ M₂) There are two atoms in the unit cell with masses and M2 and the force constant of nearest M₁M₂, is kept constant. The velocity of M₂+ M₂ neighbor interaction is F and the effective mass, = sound will be: A) B) C) NIP M₁ + M₁ 2√√2(M₁+M₁) M₁ + M₁ D)=√ 4 M₁M₂ PO -sin²

QUESTION 24 For a diatomic linear chain, the phonon dispersion relation (k) has two branches corresponding to + and-sign respectively: 2 w(K) = f (M₂₁ + M₂) ± ƒ [(M₂ ²+ M₂) There are two atoms in the unit cell with masses and M2 and the force constant of nearest M₁M₂, is kept constant. The velocity of M₂+ M₂ neighbor interaction is F and the effective mass, = sound will be: A) B) C) NIP M₁ + M₁ 2√√2(M₁+M₁) M₁ + M₁ D)=√ 4 M₁M₂ PO -sin²

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter7: Quantum Mechanics

Section: Chapter Questions

Problem 48P: Assume that a proton in a nucleus can be treated as if it were confined to a one-dimensional of...

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