When prongs of a tuning fork vibrate to and fro about their mean position then a region of [[1]] is formed.

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When prongs of a tuning fork vibrate to and fro about their mean position then a region of compression and rarefaction is formed.
A sound wave is a movement of energy travelling through a medium (air, water or solids) due caused due to a pattern of disturbances. When we hit a tuning fork with the help of a rubber pad, the two of its prongs start to vibrate at their mean position. When the prongs of the tuning fork move in the outward direction, they push and compress the air near the prongs which results in a region of high pressure which is also called compression when prongs move inward direction, it forms a region of low pressure, also known as rarefaction
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