Question

A 3.0m long metal pipe, closed at the top end, is held vertically above a large water tank. It is then very slowly pushed vertically down into the water and held there such that the top end of the pipe is at level with the water surface. Take the density of water to be 1000 kgm-³. Then
(A) the length of the trapped air column is 2.8 m. (B) the pressure of the trapped air is 1.24 times the atmospheric pressure. (C) the entropy of the air in the pipe decreases in this process. (D) the pipe executes simple harmonic oscillation when the top end of the pipe is released.​

Answer 1

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HERE IS UR ANSWER

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A 3.0m long metal pipe, closed at the top end, is held vertically above a large water tank. It is then very slowly pushed vertically down into the water and held there such that the top end of the pipe is at level with the water surface. Take the density of water to be 1000 kgm-³. Then the entropy of the air in the pipe decreases in this process.

Answer 2

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the entropy of the air in the pipe decreases in this process.

option c) is correct.