Answer :

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Regions in a sound wave where particles are farthest apart are called Rarefactions. Rarefaction is the segment of one cycle of a longitudinal wave during its travel or motion with the other segment being compression. A succession of rarefactions and compressions makes up the longitudinal wave motion that emanates from an acoustic source.
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Regions in a sound wave where particles are farthest apart are called Rarefactions.

 Explanation:

Rarefaction is the portion of one round of a longitudinal wave through its journey or motion with another segment being confining. A series of rarefaction and compression present up to the longitudinal wave motion that originates from an acoustic origin.

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