Assertion: Transverse mechanical wave does not travel in air.
Reason: Air has only bulk modulus of elasticity.

Both assertion and reason are correct and reason is the correct explanation of assertion.

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Both assertion and reason are correct but reason is not a correct explanation of assertion

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Assertion is correct but reason is incorrect

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Assertion is incorrect but reason is correct

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Solution

The correct option is A Both assertion and reason are correct and reason is the correct explanation of assertion.
A transverse mechanical wave can travel only in solids but not in fluids, because fluids can't sustain shear stress.
$\Rightarrow$ Assertion is correct.
Air has only bulk modulus of elasticity. However for a transverse wave to travel in the medium, medium should posses shear modulus. It is because transverse wave produces shear stress in the material medium through which they propagate.

$\Rightarrow$ Reason is also correct and it is the correct explanation of assertion.
Hence, option $(a)$ is correct.

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Transverse & Longitudinal Waves

Standard XII Physics

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Assertion: Transverse mechanical wave does not travel in air. Reason: Air has only bulk modulus of elasticity.

Assertion: Transverse mechanical wave does not travel in air.
Reason: Air has only bulk modulus of elasticity.