Question

How sound propagates ? Explain its propagation in air.

-this is a long Question so answer should be long-​

Answer 1

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Sound propagates through air as a longitudinal wave. The speed of sound is determined by the properties of the air, and not by the frequency or amplitude of the sound. Sound waves, as well as most other types of waves, can be described in terms of the following basic wave phenomena.

Sound waves are called longitudinal waves as the particles of the medium vibrate in a direction parallel to the direction of propagation of the wave.

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Answer 2

(i) Sound propagates through the medium as a series of compressions and rarefactions.

When a vibrating object moves forward it pushes and compresses the air in front of it creating a region of high pressure (compression).

When the vibrating object moves backwards it creates a region of low pressure (rarefaction)

(iii) Sound waves are called longitudinal waves as the particles of the medium vibrate in a direction parallel to the direction of propagation of the wave.