what is longtitnal wave ?
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Longitudinal wave, wave consisting of a periodic disturbance or vibration that takes place in the same direction as the advance of the wave. ... Sound moving through air also compresses and rarefies the gas in the direction of travel of the sound wave as they vibrate back and forth.
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Longitudinal waves are the waves where the displacement of the medium is in the same direction as the direction of the travel of the wave. The distance between the centres of two consecutive regions of compression or the rarefaction is defined by wavelength, λ.
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