Sound waves are a mechanical waves as well as a longitudinal wave ( a and b).
Sound waves
Waves can be classified by the method of propagation or by the direction of wave motion. We know that longitudinal waves are those waves in which the direction of wave travel is parallel to that of the disturbance while mechanical waves depend on medium for propagation.
Since sound waves meets the both criteria, sound waves are a mechanical waves as well as a longitudinal wave.
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