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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
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- three nodes and three antinodes
- three nodes and four antinodes
- four nodes and three antinodes
- four nodes and four antinodes
Correct Option: D
Third overtone has a frequency 7 n, which means L = 7λ/4 = three full loops + one half loop, which would make four nodes and four antinodes.
