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When the vibrating object moves backward, it creates a region of low pressure called __________.

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compression

rarefaction

frequency

wavelength

answer is B.

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Detailed Solution

Sound wave results from the back-and-forth vibration of the particles of the medium through which the sound wave is moving. Because of the motion of the air particles, there are regions in the air where the air particles are spread apart.

The sound wave consists of a repeating pattern of high-pressure and low-pressure regions moving through a medium.

Low air pressure regions are called rarefactions.

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