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Question

    
Sound waves are a sequence of __ and rarefactions.
  1. compression
  2. reflections
  3. refractions
  4. collisions


Solution

The correct option is A compression

Sound waves are a sequence of compressions and rarefactions. A compression is a region in a longitudinal wave where the particles are closest together. A rarefaction is a region in a longitudinal wave where the particles are farthest apart.

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