Assertion :The pressure node in reasonance column apparatus is not formed at the open end but slightly above. Reason: When a wave undergoes reflection from a denser medium, it undergoes a phase change of $π$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Stationary waves are produced by superposition of two waves of same freq is amplitude travelling with same velocity in opposite direction Due to constructive interference these produce certain fixed points along with the medium which undengo zero displacement These points oif no displacement are known as nodes. Ans because of boundary conditions be which pressure should be equal to atmosphere pressure where there is an open and which means no pressure distrisance or displacement of particles at open end which means there should ne a mole at open end when a wave undergoes reflection from a denser medium it undergoes a phase range of $I I$
So the answer is correct

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Assertion :The pressure node in reasonance column apparatus is not formed at the open end but slightly above. Reason: When a wave undergoes reflection from a denser medium, it undergoes a phase change of π.

Assertion :The pressure node in reasonance column apparatus is not formed at the open end but slightly above. Reason: When a wave undergoes reflection from a denser medium, it undergoes a phase change of $π$ .