The wave which propagates in terms of compressions and rarefactions :

Options :
  1. Transverse
  2. Non-elastic
  3. Sectional
  4. Longitudinal
Answer and Explanation :-

Answer: Option 4

Explanation:

The direction of the motion of the sound waves is same as that of air particles hence they are classified as longitudinal waves. They travel in the form of compression and rarefaction.

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