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Question

Propagation of sound can be visualized as:


A

The propagation of density variations.

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B

The propagation of pressure variations.

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C

A series of compressions and rarefactions.

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D

All of these.

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Solution

The correct option is D

All of these.


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 backward, it creates a low pressure or low density region. This region is called rarefaction. Thus a sound wave have consecutive high pressure and low pressure regions which we call compression and rarefaction respectively.


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