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Question

Sound waves are a sequence of compressions and _________ .

A
amplitudes
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B
wavelengths
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C
rarefactions
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D
pitch
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Solution

The correct option is C rarefactions
Sound waves are a sequence of compressions and rarefactions. A compression is a region in a longitudinal wave where the particles are closer than normal. A rarefaction is a region in a longitudinal wave where the particles are farther than normal.

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