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Physics

Assertion (A) : Sound travels faster in humid air than in dry air.

Reason (R) : The increase of moisture in air tends to decrease the density of air.

  1. both A and R are true and R is the correct explanation of A
  2. both A and R are true and R is not the correct explanation of A
  3. assertion is false but reason is true
  4. assertion is true but reason is false

Sound

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Answer

both A and R are true and R is the correct explanation of A

Explanation

Assertion (A) is true because the speed of sound in air increases with the increase in humidity in air due to decrease in density of air.

Reason (R) is true because the density of water vapour is about 5/8th times the density of dry air at ordinary temperature, therefore the increase of moisture in air tends to decrease the density of air.

As lower density due to moisture increases the speed of sound so reason correctly explains the assertion

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