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:

v_{m} < v_{d}

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v_{m} > v_{d}

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v_{m} v_{d} = 1

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v_{m} {= v}_{d}

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Solution

The correct option is A $v_{m} < v_{d}$
Velocity of sound in air, $v = \sqrt{\frac{γ P}{d}}$
$\Rightarrow$ $v \propto \frac{1}{\sqrt{d}}$

Since, moist air is denser than dry air $\Rightarrow v_{m} < v_{d}$

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