1. For a derivation of the wave equation and the sound velocity see
D. L. Goodstein, "Long Wavelength Compressional Modes," Section 3.2b in States of Matter(Dover, 1985). (184 kb)
2. P. Morse, Vibration and Sound(Acoustical Society of America, 1991).
3. For a reminder about Bessel Functions and/or Fourier series, see G. Arfken and H.J. Weber, Mathematical Methods for Physicists,4th ed. (Academic Press, 1995).
4. H.B. Callen, Thermodynamics and an Introduction to Thermostatics,2nd ed. (Wiley, 1985).
5. G. Bekefi and A.H. Barrett, "Resonance," Section 1.4 in Electromagnetic Vibrations, Waves, and Radiation(MIT Press, 1978). (236 kb)
6. J.B. Mehl, "Analysis of Resonance Standing-Wave Measurements,"J Acoust Soc Am 64 (5) 1523-1525 (1978).
7. G. Ahlers,"2nd-Sound Damping Near the Superfluid Transition of He-4," Phys Rev Lett 43 (19) 1417-1420 (1979).
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