A closed organ pipe produces
Correct answer: C. only odd harmonics
- A. all harmonics
- B. only even harmonics
- C. only odd harmonics
- D. no harmonics at all
Explanation
The node and antinode boundary conditions can only be satisfied by odd multiples of the fundamental, so a closed pipe gives the first, third, fifth and so on. An open pipe supports every harmonic, which is why it sounds richer. This difference in harmonic content is a large part of why a clarinet and a flute have such different tone.
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About Organ Pipes
Organ pipes produce standing sound waves in air columns, with resonance determined by whether each end is open or closed. The topic covers nodes, antinodes, fundamental frequency, harmonics, wavelength and end correction. Open pipes support all harmonics, while closed pipes support only odd harmonics under the ideal model.
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