Question

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

• A. Both assertion and reason are correct and reason is the correct explanation of assertion.
• B. Both assertion and reason are correct but reason is not a correct explanation of assertion
• C. Assertion is correct but reason is incorrect
• D. Assertion is incorrect but reason is correct

Answer 1

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 $\left(a\right)$ is correct.