First slide

Introduction to waves

Question

Velocity of sound in air is

Easy

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

Solution

$v = \sqrt{\frac{γ P}{ρ}}$ ; as P changes, $ρ$ also changes. Hence $\frac{P}{ρ}$ remains constant so speed remains constant.

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