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Q.

Is it true that compressions and rarefactions are produced in the air near a source of the sound?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Because sound is a mechanical wave, it must travel through a medium. The created vibrations travel parallel to the direction of sound propagation, resulting in high and low-pressure regions. When a vibrating object moves forward, it pushes and compresses the air ahead of it, creating a high-pressure region. This is referred to as a compression region (C). This compression begins to displace itself away from the vibrating object. When a vibrating object moves backwards, it creates a low-pressure region known as rarefaction (R).
 
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