Sound waves in air are always longitudinal because

Air can be compressed or rarefied

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Air is a mixture of several gases

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Air have no rigidity

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Air exerts pressure

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Solution

The correct option is C Air have no rigidity
Air being a fluid cannot sustain shear stress thus has no rigidity. This means that the deformation will be along the direction of wave propagation.

Therefore, sound in air propagates in the form of compression and rarefaction along the direction of wave. We know that in a longitudinal wave, particles of the medium oscillates along the direction of wave propagation.

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Sound waves are always longitudinal in nature.

Sound waves always behave as a longitudinal waves.

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