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Problem Consider a two dimensional square lattice with one atom of mass m per lattice...

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Problem Consider a two dimensional square lattice with one atom of mass m per lattice point interacting with 4k qa only nearest neighbours with force constant k Take the phonon dispersion curve to be m sin 2 At high temperature kT ho the mean square displacement of an atom from its equilibrium position will be a kT k b 2KT c 4k 2kT d 4

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