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Question

What can the propagation of sound be visualised as?
(More than one option can be correct.)

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
A transverse wave
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Solution

The correct option is C A series of compressions and rarefactions
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 known as compression.
When a particle moves backward, it creates a low pressure or low density region. This region is known as rarefaction.
When sound propagates in a medium, the particles of the medium vibrate along the direction of propagation of wave.
Therefore, sound wave is a longitudinal wave.

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