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4.7 In Problem 4.6, if w₁, ₂ and 3 are, respectively, the maximum frequency of the acoustic branch and minimum and maximum frequencies of the optical branch, show that for fi > f2, 2 f₂ a = 0₂ 2 f₁ M and W3 = 2(f₁ + f₂) M M
4.7 In Problem 4.6, if w₁, ₂ and 3 are, respectively, the maximum frequency of the acoustic branch and minimum and maxim
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4.7 In Problem 4.6, if w₁, ₂ and 3 are, respectively, the maximum frequency of the acoustic branch and minimum and maxim
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