Explain the terms 'compression' and 'rarefactions' of a wave. What type of waves consist of compressions and rarefactions?
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A compression is that part of a longitudinal wave in which the particles of the medium are closer to one another than they normally are, and there is a momentary reduction in volume of the medium. A rarefaction is that part of a longitudinal wave in which the particles of the medium are farther apart than normal, and there is a momentary increase in the volume of the medium. Longitudinal waves consist of compressions and rarefactions.
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