What Are the Frequencies of the First Two Overtones in a Closed Air Column?

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SUMMARY

The frequencies of the first two overtones in a closed air column with a fundamental frequency of 500Hz are 1500Hz and 2500Hz. The correct formula for calculating the overtone frequencies is f = (n+1)f, where n represents the overtone number. In this case, the first overtone (n=1) results in 1500Hz, and the second overtone (n=2) results in 2500Hz. It is essential to note that only odd harmonics are present in a closed air column, which affects the calculation of overtone frequencies.

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  • Understanding of fundamental frequency and overtones in acoustics
  • Familiarity with harmonic series in closed air columns
  • Knowledge of the equations for calculating overtone frequencies
  • Basic principles of wave behavior in physics
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  • Study the harmonic series in closed and open air columns
  • Learn about the mathematical derivation of overtone frequencies
  • Explore the effects of temperature and pressure on sound speed in air
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Students studying physics, particularly those focusing on acoustics and wave behavior, as well as educators teaching concepts related to sound frequencies and harmonics.

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Homework Statement


An air column closed at one end has a fundamental frequency of 500Hz. What are the frequencies of the first two overtones?

Answers:
1500Hz
2500Hz

Homework Equations


Overtone:
f = (n+1)f
n = overtone

Harmonic:
f = nf

The Attempt at a Solution


f1 = (n+1)f
= (1+1)500
= 1000Hz

f2 = (2+1)500
= 1500Hz
Im not getting it, what am I doing wrong? Its asking for frequency of overtone #1/overtone #2, I put the right values in the equation but I still don't get the right answer.
 
Physics news on Phys.org
In a pipe closed at one end, only odd harmonics occur, so if the fundamental frequency is f1, then the frequencies of the harmonics will be fn = nf1, where n = 3,5...
 

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