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For monatomic basis, dispersion relation can be written as ?^2 = (4?/?)???^2(??/2). If group velocity ??...

For monatomic basis, dispersion relation can be written as ?^2 = (4?/?)???^2(??/2). If group velocity ?? = ??/?? , derive a relation for group velocity and find the value of group velocity at the edge of the zone boundary where ? =?/? .

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