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A closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has

1. three nodes and three antinodes
2. three nodes and four antinodes
3. four nodes and three antinodes
4. four nodes and four antinodes

Correct answer: four nodes and three antinodes

Solution

In a closed organ pipe, the third overtone corresponds to the 7th harmonic. For the 7th harmonic, there are four nodes and three antinodes in the pipe.

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