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Q.

Sound waves in air are always longitudinal, because


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a

Density of air is very small

b

Air is a mixture of several gases

c

Air does not have a modulus of rigidity

d

Of the inherent characteristics of sound waves in air. 

answer is C.

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Detailed Solution

Longitudinal waves travel in an elastic medium in the form of compressions and rarefactions which changes its volume, elasticity and pressure. Since air is completely an elastic medium (it does not have a modulus of rigidity, sound waves in air are always longitudinal.
 
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