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5 . a) In lecture we derived the Debye model for the specific heat of a lattice in the
customary manner which assumes the same maximum frequency for both
transverse and longitudinal waves; hence we introduced a single Debye
temperature. Rederive this model permitting different maximum frequencies for
transverse and longitudinal waves, and hence introduce two Debye temperatures.
b) Approximate your model for very, very low temperatures and show that the T3
law is still valid.
Nonzero Solutions to equation
0 : 1 - x / n - e - *
With formulas and explanations, the problem is solved.