Examples of longitudinal waves that require a medium in order to move include a
1. 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 propagation
The 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.
