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In the discussion of calculating specific heat for a solid, it is assumed that the whole solid body is a molecule with N atoms and the Hamiltonian of this solid is similar to that of a molecule with N atoms, i.e.
## \mathcal{H}_1=\mathcal{V}^{*}+\sum_{j=1}^{3n} \big(\frac{\widetilde{p}_s^2}{2m}+\frac{K_s}{2} \widetilde{u_s}^2\big) ##. How this assumption of taking solid as a huge molecule is justified?
## \mathcal{H}_1=\mathcal{V}^{*}+\sum_{j=1}^{3n} \big(\frac{\widetilde{p}_s^2}{2m}+\frac{K_s}{2} \widetilde{u_s}^2\big) ##. How this assumption of taking solid as a huge molecule is justified?
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