(a) Compare the mean thermal wavelength (lambda_{T}) of neutrons at a typical room temperature with the minimum...
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(a) Compare the "mean thermal wavelength" \(\lambda_{T}\) of neutrons at a typical room temperature with the "minimum wavelength" \(\lambda_{\min }\) of phonons in a typical crystal.
(b) Show that the frequency \(\omega_{D}\) for a sodium chloride crystal is of the same order of magnitude as the frequency of an electromagnetic wave in the infrared.
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