(A) : Transverse mechanical waves can not propagates in liquids and gases.
(R) : Liquids and gases flow when acted on by shearing stress, they can not sustain shear stress.

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is A.

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Detailed Solution

The medium needs to be elastic in order to apply a restoring force when shearing stress is applied, which is necessary for the transmission of a transverse mechanical wave. Nevertheless, liquids and gases cannot withstand shear stress to produce restoring force; instead, they begin to flow when shear tension is applied.

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