(A) : In a longitudinal stationary wave a displacement node coincides with a pressure anti node.
(R) : Restoring force is maximum at node and minimum at anti node.

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(A) is true but (R) is false

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

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

Both (A) and (R) are false

answer is C.

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Detailed Solution

In a longitudinal stationary wave a displacement node coincides with a pressure anti node. Phase difference between displacement wave and pressure wave is $\frac{π}{2}$ .
Restoring force is maximum at antinode and minimum at node.

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