Two different solids consist of the same number of atoms


Two different solids consist of the same number of atoms, and vibrations travel with the same speed in both. But the atomic spacing in solid A is twice as large as the atomic spacing in solid B.

(a) For which solid will the cutoff energy εD be the larger? By how many times?

(b) At low temperatures, which solid will have the largest internal energy? By how many times?

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Mechanical Engineering: Two different solids consist of the same number of atoms
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