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3. Basis of two unlike atoms. For the problem treated by (18) to (26), find the am- plitude ratios w/o for the two branches at

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3. Basis of two unlike atoms. For the problem treated by (18) to (26), find the am- plitude ratios w/o for the two branches at Kmax = #/a. Show that at this value of K the two lattices act as if decoupled: one lattice remains at rest while the other lat tice moves

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