wave_mechanics assertion_and_reason Question 17
Assertion : On a rainy day sound travels slower than on a dry day. Reason : When moisture is present in air the density of air increases.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason are both false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: D
Solution:
When moisture is present in air, the density of air increases.
It is because the density of water vapours is less than that of dry air.
The velocity of sound is directly proportional to the square root of the bulk modulus and inversely proportional to the square root of density, hence sound travels faster in moist air than in dry air.
Therefore, on a rainy day sound travels slower than on a dry day.
BETA
