First slide

Speed of wave

Question

Under similar conditions of temperature and pressure, in which of the following gases the velocity of sound will be largest?

Difficult

A

$H_{2}$
B

$N_{2}$
C

He
D

${CO}_{2}$

Solution

The speed of sound in air is $v = \sqrt{\frac{γRT}{M}}$
$\frac{γ}{M}$ of $H_{2}$ is maximum, hence speed of sound in $H_{2}$ shall be maximum.

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