A sound wave consists of:

Number of compression pulses only

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Number of rarefaction pulses only

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Number of compression and rarefaction pulses one after the other

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Vacuum only

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Solution

The correct option is C Number of compression and rarefaction pulses one after the other
A sound wave consists of a number of compression and rarefaction pulses one after the other. A compression is a region in a longitudinal wave where the particle are close together. A rarefaction is a region in a longitudinal wave where the particles are further apart.

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