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・ Refraction (metallurgy)
Refraction (sound)
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Refraction (sound) : ウィキペディア英語版
Refraction (sound)
Refraction, in acoustics, comparable to the refraction of electromagnetic radiation, is the bending of sound propagation trajectories (rays) in inhomogeneous elastic media (gases, liquids, and solids) in which the wave velocity is a function of spatial coordinates. Bending of acoustic rays in layered inhomogeneous media occurs towards a layer with a smaller sound velocity. This effect is responsible for guided propagation of sound waves over long distances in the ocean and in the atmosphere.
==See also==

* Atmospheric refraction
* Deep sound channel
* Sound speed gradient
* Underwater acoustics

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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