The absorption and dispersion of ultrasonic waves in binary mixtures of inert, monatomic gases is studied using the two-fluid theory of gas mixtures. Expressions are derived for the absorption and dispersion at all ultrasonic frequencies. At low frequencies, these expressions reduce to those verified experimentally by Holmes and Tempest [Proc. Phys. Soc. (London) 75, 898–904 (1960)], while at higher frequencies new viscous effects are shown to be present.
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Edward B. Goldman (1968) studied this question.