Question

what are longitudinal waves?
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Answer 1

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The waves which travel along a spring when it is pushed and pulled at one end are longitudinal wave. When a wave travels along the spring,then each turn of the spring moves back and forth by only a small distance in the direction of waves.

Answer 2

↔Question: What are Longitudinal waves?

↔Answer: In this waves, displacement of the medium is in the same direction as, or the opposite direction to, the direction of propagation of the wave.

Ex: Sound waves.