Abstract
Dispersion of forced sound in Xe-He mixtures is found here to show mode coupling: interference between the sound mode and another excitation mode of the gas. Qualitatively different dispersion is found, depending upon whether the He mole fraction is greater or less than a critical value, if the frequency is higher than a critical frequency. Results also show that two-temperature hydrodynamics must be used to describe a disparate-mass gas in this frequency range.
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