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A standing wave always has a node at...

Question

A standing wave always has a node at...

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Solution

...the fixed ends of the medium in which it is formed.

To elaborate step by step:

  1. Understanding Standing Waves: A standing wave is a wave that remains in a constant position. This phenomenon occurs due to the interference of two waves traveling in opposite directions with the same frequency and amplitude.

  2. Nodes and Antinodes: In a standing wave, nodes are points where the wave has zero amplitude, meaning there is no movement at these points. Antinodes are points where the wave has maximum amplitude.

  3. Formation of Nodes: Nodes are formed at points where the two interfering waves cancel each other out completely. This typically happens at the fixed ends of the medium, such as the ends of a string or the closed ends of an air column.

  4. Fixed Ends: In many physical systems, such as a vibrating string or an air column in a pipe, the ends are fixed. These fixed ends constrain the movement of the medium, forcing the wave to have zero displacement at these points.

  5. Conclusion: Therefore, a standing wave always has a node at the fixed ends of the medium in which it is formed.

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