In open organ pipe___________________?
Correct answer: C. both even and odd harmonics are present
- A. only even harmonics are present
- B. only odd harmonics are present
- C. both even and odd harmonics are present
- D. selected harmonics are present
Explanation
An open pipe has displacement antinodes at both ends, allowing standing waves with wavelengths 2L/n for n = 1, 2, 3 and so on. Therefore its fundamental and all integer harmonics occur, including both even and odd harmonics. Students may choose only odd harmonics by applying the rule for a closed pipe.
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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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