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GK QUESTION#3017

Assertion (A): Longitudinal sound travels faster in steel than in ordinary air at the same temperature. Reason (R): Steel’s much greater elastic stiffness relative to its density permits faster longitudinal wave propagation than in air. Choose the correct option.

  1. AA is false but R is true.
  2. BBoth A and R are true and R is the correct explanation of A.Correct answer
  3. CBoth A and R are true but R is not the correct explanation of A.
  4. DA is true but R is false.
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Answer

B. Both A and R are true and R is the correct explanation of A.

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Explanation

Longitudinal sound travels much faster in steel than in ordinary air. Wave speed depends on elastic response relative to density; steel’s much greater stiffness more than offsets its greater density. Closer particle spacing alone is not a sufficient general explanation.

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