Question

why compression and rarefraction occurs? (class 9) ​

Answer 1

Answer:

Compression happens when molecules are forced, or pressed, together. Rarefaction is just the opposite, it occurs when molecules are given extra space and allowed to expand. ... As the molecules are pressed together, they pass the kinetic energy to each other. Thus sound energy travels outward from the source.

Answer 2

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Compressions and rarefactions are produced because of the disturbance in medium caused by sound wave.

Sound waves propagate because of compressions and rarefactions of the particles of the medium.

Compressions are the regions of high pressure (high density of the particles).