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Question

High density region in a longitudinal wave is known as  _____.
  1.  rarefaction
  2. crest
  3. trough 
  4.  compression 


Solution

The correct option is D  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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