Q.

Velocity of sound in air is 

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a

Faster in dry air than in moist air 

b

Directly proportional to pressure 

c

Directly proportional to temperature

d

Independent of pressure of air  

answer is D.

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Detailed Solution

v=γPρ; as P changes, ρ also changes. Hence Pρ remains constant so speed remains constant.

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Velocity of sound in air is