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Question

Assertion :When a closed organ pipe vibrates, the pressure of the gas at the closed end remains constant. Reason: In a stationary-wave system, displacement nodes are pressure antinodes, and displacement antinodes are pressure nodes.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is D Assertion is incorrect but Reason is correct
In a stationary-wave system, displacement nodes are pressure antinodes, and displacement antinodes are pressure nodes. at the closed boundary there is a displacement node and pressure antinode, thus pressure varies at the closed boundary. hence Option "D" is correct.

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