Sound waves in air are always longitudinal because,

Options

A. of the inherent characteristics of sound waves in air
B. air does not have a modulus of rigidity
C. air is a mixture of several gases
D. density of air is very small

Answer

B

Explanation

A longitudinal wave motion travels in the form of compressions and rarefactions which involves changes in volume and elasticity and pressure. Therefore sound comes to us from the source in form of longitudinal waves only as it travels in air, `v=sqrt((yP)/(p))`