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K ka Q2. The phonon dispersion for a monatomic lattice chain is o=2, sin Derive an m expression of its group velocity. Prove that the group velocity at the zone boundary is zero.

K ka Q2. The phonon dispersion for a monatomic lattice chain is o=2, sin Derive an m expression of its group velocity. Prove that the group velocity at the zone boundary is zero.

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K ka Q2. The phonon dispersion for a monatomic lattice chain is o=2, sin Derive an m expression of its group velocity. Prove that the group velocity at the zone boundary is zero.
Transcribed Image Text:K ka Q2. The phonon dispersion for a monatomic lattice chain is o=2, sin Derive an m expression of its group velocity. Prove that the group velocity at the zone boundary is zero.
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