Organ Pipe Harmonic Frequencies and Pipe Length Calculation

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SUMMARY

The discussion focuses on determining the type of organ pipe based on the given harmonic frequencies of 1760 Hz and 2160 Hz. The calculations reveal that these frequencies correspond to the second and third harmonics of an open pipe, as the relationship between the frequencies indicates that the pipe is open. The length of the pipe can be calculated using the formula L = v/2f, where v is the speed of sound in air, approximately 343 m/s. This results in a pipe length of approximately 0.097 meters.

PREREQUISITES
  • Understanding of harmonic frequencies in acoustics
  • Knowledge of the speed of sound in air (approximately 343 m/s)
  • Familiarity with the formulas for open and closed pipes
  • Basic algebra for solving equations
NEXT STEPS
  • Research the characteristics of open versus closed organ pipes
  • Learn how to calculate the fundamental frequency of an organ pipe
  • Explore the impact of temperature and altitude on the speed of sound
  • Study the harmonics of different musical instruments
USEFUL FOR

Musicians, acoustics students, and anyone interested in the physics of sound and musical instruments will benefit from this discussion.

jackleyt
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Homework Statement


An organ pipe has two successive harmonics with frequencies 1760 Hz and 2160 Hz. Is this an open or stopped pipe? Which two harmonics are these? What is the length of the pipe?


Homework Equations


L=v/2f


The Attempt at a Solution


I'm really just having trouble with the first question. How can you tell what kind of pipe it is?
 
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For closed pipe, nth harmonic is
fn = (2n-1)fo, where fo is the fundamental frequency.
And f(n+1) = (2n+1)fo,
Solve for n. If n is integer, the pipe is closed. Otherwise it is open.
 

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