12. Kern E. Kenyon, Momentum of sound waves

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Volume 21: Pages 68-69, 2008

Momentum of sound waves

Kern E. Kenyon 1

14632 North Lane, Del Mar, California 92014-4134, USA

Maxwell’s equations predicted that the linear momentum of light waves equals the energy divided by the wave phase speed in free space. Then almost 40 years ago it was determined that the linear momentum of surface gravity waves equals the total energy divided by the phase speed of these waves. Consistent with the earlier results we show here that the ratio of the momentum to the energy of sound waves equals one divided by the wave phase speed. Assumptions are one dimensional compressible flow, plane waves of infinitesimal amplitude, and no viscosity.

Keywords: Sound Wave Momentum

Received: August 25, 2007; Accepted: May 20, 2008; Published Online: December 15, 2008