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Home» class 9»Science» Chapter 11: Sound

Describe with the help of a diagram, how compressions and rare... - Science

Question

Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.

Answer

Compressions and Rarefactions (Explanation)

When a sound source (like a speaker or tuning fork) vibrates, it makes the nearby air particles move.

  • When the source moves forward, air particles come close together.
    This region is called compression (high pressure).

  • When the source moves backward, air particles move far apart.
    This region is called rarefaction (low pressure).

These compressions and rarefactions move through air and carry sound.