Velocity and Absorption Coefficient of Sound Waves in Classical Gases


  • A. G. Magner Institute for Nuclear Research, Nat. Acad. of Sci. of Ukraine
  • M. I. Gorenstein Bogolyubov Institute for Theoretical Physics, Nat. Acad. of Sci. of Ukraine
  • U. V. Grygoriev Institute for Nuclear Research, Nat. Acad. of Sci. of Ukraine



hydrodynamics, kinetic approach, ultrasonic plane sound waves, velocity, absorption


The velocity and absorption coefficient of plane sound waves in classical gases are obtained by solving the Boltzmann kinetic equation. This is done within the linear response theory as a reaction of the single-particle distribution function to a periodic external field. The nonperturbative dispersion equation is derived in the relaxation time approximation and solved numerically. The obtained theoretical results demonstrate an universal dependence of the sound velocity and scaled absorption coefficient on the variable wт , where w is the sound frequency, and т−1 is the particle collision frequency. In the region of wт ∼ 1, a transition from the frequent- to rare-collision regime takes place. The sound velocity increases sharply, and the scaled absorption coefficient has a maximum – both theoretical findings are in agreement with the data.


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How to Cite

Magner, A. G., Gorenstein, M. I., & Grygoriev, U. V. (2020). Velocity and Absorption Coefficient of Sound Waves in Classical Gases. Ukrainian Journal of Physics, 65(3), 217.



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