Question

Explain the formation of sound waves in
air.​

Answer 1

$\bf\large\underline\red{Answer:-}$

Sound is produced by a vibrating body and it propagates through a medium as a longitudinal progressive wave. To explain this consider how a tuning fork produces sound waves in air. When a tine (prong) of a tuning fork is gently struck by a rubber hammer, both the tines vibrate to-and-fro. As a tine moves outward, the layer of air next to it gets compressed. Due to the elasticity of air, this layer tends to expand back. In doing so, it compresses the layer adjacent to it, This process continues and a region of compression travels through the air.

Meanwhile, the tines move inward. This decreases the pressure on the layer next to a tine and creates a region of rarefaction, When the first layer rushes to occupy this partial vacuum, the region of rarefaction moves outward. This way, the region of rarefaction follows the compression outward. Thus, as the tines vibrate, the resulting sound travels as a train of longitudinal compression and rarefaction. Vocal cords in our larynx and the reeds of a mouth organ or harmonium also produce sound the same way.

Answer 2

Answer:

Sound waves in air are formed as longitudinal waves and particls of air vibrate parllel to direction of sound wave

It moves as particles first compress and then expend and it repeat.