Which is a longitudinal wave that requires a medium to move?

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Examples of longitudinal waves that require a medium in order to move include a1. compression wave  moving along a spring produced by compressing and then releasing a few coils of a spring)2. Sound wave.- sound wave travels in the form of a longitudinal wave and it requires a material medium for its propagationThe origin of sound is always a kind  of vibrating body. Human voice originates from the vibrations in the vocal chords,  and the sound of musical instruments is due to vibration of the air column.

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