In a compressional wave, the less dense region is called what?

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Multiple Choice

In a compressional wave, the less dense region is called what?

Explanation:
In a compressional (longitudinal) wave, the medium moves back and forth along the direction of travel, creating alternating regions of higher and lower density. The region where particles are pushed closer together is a compression, while the region where they are spread apart is a rarefaction. The less dense region is called a rarefaction. Amplitude describes how large the wave’s displacement or pressure variation is, not a region type, and terms like density peak aren’t standard for describing parts of a wave.

In a compressional (longitudinal) wave, the medium moves back and forth along the direction of travel, creating alternating regions of higher and lower density. The region where particles are pushed closer together is a compression, while the region where they are spread apart is a rarefaction. The less dense region is called a rarefaction. Amplitude describes how large the wave’s displacement or pressure variation is, not a region type, and terms like density peak aren’t standard for describing parts of a wave.

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