Question

The velocity of sound in air is affected by change in the _________.
$1$. moisture content of air
$2$. temperature of air
$3$. composition of air
$4$. atmospheric pressure
Choose the correct answer.

• A. $1,2$ and $3$
• B. $2,3$ and $4$
• C. $1,2$ and $4$
• D. $1,3$ and $4$

Answer 1

The correct option is B $2,3$ and $4$

Temperature changes the sound velocity.

Humidity and composition of air change the density which changes the sound velocity.

While, Sound velocity is almost independent of Atmospheric pressure.

$speed=\sqrt{\frac{\gamma RT}{M}}$, and

$v=\sqrt{\frac{Elasticitycoefficient}{density}}$

So 1, 2 and 3 are correct.