define sound wave and its equation
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When we analysed a transverse wave (that in a string), we used y as the displacement for a wave travelling in the x direction. In a longitudinal wave, displacements are parallel to the direction of the wave. When analysing a longitudinal wave, we still use y for the displacement, but remember that this displacement is in the x direction.
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A wave is a disturbance that transfers energy from one place to another without requiring any net flow of mass. ... In a longitudinal wave, such as a sound wave, the particles oscillate along the direction of motion of the wave.
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