A closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has (a) three nodes and three antinodes (b) three nodes and four antinodes (c) four nodes and three antinodes (d) four nodes and four antinodes

Answer: (d). Third overtone of a closed pipe: L=(7λ)/(4) (7th harmonic). From the closed end: N A N A N A N A, i.e. 4 nodes and 4 antinodes. So the answer is (d).

A closed organ pipe (closed at one end) is excited to support the… | NEET 1991 (AIPMT)

Q121NEET 1991 · AIPMTEasy

Organ Pipes & Resonance Tube

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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Answer: (d)

Third overtone of a closed pipe: $L=\frac{7\lambda}{4}$ (7th harmonic).
From the closed end: N A N A N A N A, i.e. 4 nodes and 4 antinodes.
So the answer is (d).

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