An elementary analysis of wave propagation in viscoelastic materials is presented. Data on linear viscoelasticity obtained with ultrasound high frequency wave excitation are reviewed in this light. It is concluded that such data seem to indicate that a), propagation of very high frequency waves is dominated by a viscous mechanism; and b), values of the complex propagation modulus M* do not lie on any reasonable extrapolation of the mechanical G* data. Possible interpretations of these results are discussed.

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