Abstract
Sound rays, sound beams, plane waves, and cylindrical waves are possible only near a sound source. According to Huygen’s principle, every point in a wave front acts as a secondary source and propagates energy in all directions. This spreading out of the sound energy leads to a divergence of the sound waves so that, eventually, at great distances from the source, all sound waves become spherical waves. From a great distance, every sound source appears as the center of outgoing spherical waves.
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Skudrzyk, E. (1971). Spherical Waves, Sources, and Multipoles. In: The Foundations of Acoustics. Springer, Vienna. https://doi.org/10.1007/978-3-7091-8255-0_19
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DOI: https://doi.org/10.1007/978-3-7091-8255-0_19
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