Question

describe how compressions and rare fractions are produced in air near a source of sound?

Answer 1

Compression and rarefaction are produced because of the disturbance in medium caused by sound wave. Sound wave propagates because of compression and rarefaction of the particles of the medium.

When an object starts vibrating, it creates disturbance in medium. Because of the disturbance particles of medium come closer to each other compare to their normal position on the other hand adjacent particles go farther to each other. Both happen simultaneously.

The region where particles are come closer to each other is called compression and region where particles go farther to each other is called rarefaction.