Impedance theory of sound absorption: The best absorber and the black body
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- Bobrovnitskiĭ, Y.I. Acoust. Phys. (2006) 52: 638. doi:10.1134/S1063771006060030
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The impedance theory of scattering (which was proposed by the author—see Acoust. Phys. 52, No. 5 (2006)) is used as the basis for studying the extremum properties of the absorption and scattering sound powers of arbitrary elastic bodies in an arbitrary acoustic medium. Impedance-type conditions are obtained for the surfaces of a best absorber, a perfect scatterer, and a so-called Macdonald body. The absorbing and scattering properties of these objects are studied in comparison with the Kirchhoff black body. Illustrative examples are presented.