The velocity of sound in a gas at pressure $P$ and density $d$ is
AIIMS 2009, Easy
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$\mathrm{v}=\sqrt{\frac{\gamma \mathrm{RT}}{\mathrm{M}}}$
$\mathrm{PV}=\mathrm{RT}$
$\mathrm{P} \frac{\mathrm{M}}{\mathrm{d}}=\mathrm{RT}$
$\frac{P}{d}=\frac{R T}{M}$
$v=\sqrt{\frac{\gamma \mathrm{P}}{\mathrm{d}}}$
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