Why does pressure at a point increase when sound wave passes across point?
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Sound waves are longitudinal.
Since they are longitudinal, as they move there are regions where air particles are compressed together and areas where they are spread out.
The areas where they are spread out is known as rarefaction whereas areas where they are compressed is known as compression.
At the points of compression air particles are compressed together and hence this becomes a region of high pressure.
At the points of rarefaction, the air molecules are spread apart hence it is a point of low pressure.
Due to this property sound wave is known as Pressure wave.
Answer: The pressure at that point increases since at the compression point, air molecules are compressed together leading to high pressure.
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