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GK QUESTION#3022

For a longitudinal sound wave in air, consider these statements: I. Compression is a region of pressure above the undisturbed value. II. Rarefaction is a region of pressure below the undisturbed value. Which statements are correct?

  1. AOnly I
  2. BOnly II
  3. CBoth I and IICorrect answer
  4. DNone of the above
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Answer

C. Both I and II

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Explanation

For a longitudinal sound wave in air, a compression has pressure above the undisturbed value and a rarefaction has pressure below it. These pressure variations travel through the medium; air particles oscillate about their equilibrium positions.

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