First slide

Travelling wave

Question

If v_m is the velocity of sound in moist air, v_d is the velocity of sound in dry air, under identical conditions of pressure and temperature

Moderate

A

v_m > v_d
B

v_m < v_d
C

v_m = v_d
D

v_mv_d = 1

Solution

The density of moist air (i.e. air mixed with water vapours) is less than the density of dry air
Hence from $v = \sqrt{\frac{γP}{ρ}} \Rightarrow v_{moist air} > v_{dry air}$

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