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Question

Propagation of sound can be visualised as:


A

propagation of density variations

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B

propagation of pressure variations

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C

a series of compressions and rarefactions

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D

all of the above

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Solution

The correct option is D

all of the above


During vibration, when a particle moves forward, it compresses the air in front of it and creates a high-pressure or high-density region. This region is called compression. When a particle moves backwards, it creates a low-pressure or low-density region. This region is called rarefaction.


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