Write down the factors affecting velocity of sound in gases.

Explanation

(i) Effect of pressure : Speed of sound is independent of pressure for a fixed temperature.
(ii) Effect of temperature : Speed of sound varies directly to the square root of temperature in kelvin. Speed of sound in air increases by `0.61 ms^(-1)` per degree celcius rise in temperature.
(iii) Effect of density : Velocity of sound in a gas is inversely proportional to the square root of the density of the gas.
(iv) Effect of moisture (humidity) : Speed of sound increases with rise in humidity.
(v) Effect of wind : In the direction along the wind blowing, the speed of sound increases wherease in the direction opposite to wind blowing. the speed of sound decreases.