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Ultrasonic waves in classical gases
A G Magner1, M I Gorenstein2, U V Grygoriev3
1Institute for Nuclear Research NASU, 03680 Kiev, Ukraine.
Abstract:
The velocity and absorption coefficient for the plane sound waves in a classical gas are obtained by solving the Boltzmann kinetic equation, which describes the reaction of the single-particle distribution function to a periodic external field. Within the linear response theory, the nonperturbative dispersion equation valid for all sound frequencies is derived and solved numerically. The results are in agreement with the approximate analytical solutions found for both the frequent- and rare-collision regimes. These results are also in qualitative agreement with the experimental data for ultrasonic waves in dilute gases.
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