5.Kittel, Ch4-14, Heat capacity of liquid He at low temperature. The velocity oflongitudinal sound waves in liquid He at temperatures below 0.6K is2.383×10 cms. There are no transverse sound waves in the liquid. The density is0.145gcm³. (a) Calculate the Debye temperature. (b) Calculate the heat capacity pergram on the debye theory and compare with the experimental valueC₁ = 0.0204×7³, in Jg¹K¹. The T³ dependence of the experimental value suggeststhat phonons are the most important excitations in liquid He below 0.6K. Note thatthe experimental value has been expressed per gram of liquid. The experiments aredue to J. Wiebes, C. G. Niels-Hakkenberg, and H. C. Krammers, Physca 32, 625(1957).

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