Assertion: Oscillation of an air column with one end closed and the other open. A glass tube partially filled with water illustrates this system. The end in contact with water is a node, while the open end is an antinode. Reason: At the node the pressure changes are the largest, while the displacement is minimum (zero). At the open end - the antinode, it is just the other way - least pressure change and maximum amplitude of displacement.

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Standing Waves in Organ Pipes | PadhAiPro

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Assertion-ReasonStanding Waves in Organ Pipes

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TextSpeed of Travelling Wave in Different MediaStanding Waves in Organ Pipes