High density region in a longitudinal wave is known as _____.

rarefaction

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compression

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crest

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trough

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Solution

The correct option is B compression
If the density of air molecules is more in the given region, then the number of air molecules are close to each other. Such a region in a sound wave (or more generally a longitudinal wave) is called compression and comprises of a region of high pressure.

Following diagram depicts the compressions and rarefactions for a sound wave (longitudinal wave).

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The distance between a compression and the next rarefaction of a longitudinal wave is

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