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Longitudinal wave
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Longitudinal wave : ウィキペディア英語版
Longitudinal wave
Longitudinal waves, also known as "l-waves", are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of travel of the wave. Mechanical longitudinal waves f wave is the transverse wave, in which the displacements of the medium are at right angles to the direction of propagation. Transverse mechanical waves are also called "t-waves" or "shear waves".

==Examples==
Longitudinal waves include sound waves (vibrations in pressure, particle of displacement, and particle velocity propagated in an elastic medium) and seismic P-waves (created by earthquakes and explosions).
In longitudinal waves, the displacement of the medium is parallel to the propagation of the wave. A wave along the length of a stretched Slinky toy, where the distance between coils increases and decreases, is a good visualization. Sound waves in air are longitudinal, pressure waves.

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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