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

AIPMTAIPMT 1991Waves

Solution:

Third overtone has a frequency $4n$, $4^{\text{th}}$ harmonic = three full loops $+$ one half loop, which would make four nodes and four antinodes.

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