We find that E ≈ 3NakT at temperatures above 100 K for lead and above 2300 K for diamond. The mass of a lead atom is 3.4 × 10−25 kg, and the mass of a carbon atom is 2.0 × 10−26 kg. For each, give a rough estimate of the value of the force constant κ holding an atom in place. Use ωD ≈ (κ/m)½.
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