Limit to number of standing waves in pipes?

Click For Summary
SUMMARY

The discussion centers on the limitations of standing waves in pipes, particularly those closed at one end, which only support odd harmonics. It establishes that frequency increases with each harmonic while wavelength decreases, leading to the assumption that there is a limit to the number of harmonics a pipe can produce. This limit is attributed to the molecular level where thermal vibrations interfere with wave propagation, preventing wavelengths from becoming infinitely small. The conclusion is that while theoretical limits exist, practical limits are determined by physical properties of the medium.

PREREQUISITES
  • Understanding of wave mechanics and harmonic frequencies
  • Familiarity with the equation v = wavelength * frequency
  • Knowledge of the behavior of sound waves in closed and open pipes
  • Basic concepts of thermal vibrations and their effects on wave propagation
NEXT STEPS
  • Research the properties of sound waves in closed pipes and their harmonic series
  • Study the effects of thermal vibrations on wave behavior at the molecular level
  • Explore the concept of resonance and its implications in acoustics
  • Investigate the limits of wavelength in various physical mediums
USEFUL FOR

Physics students, acoustics researchers, and anyone interested in the principles of sound wave propagation and harmonic analysis in pipes.

eknox123
Messages
1
Reaction score
0

Homework Statement


This is a conceptual question I had not related to a specific problem- so I know with each higher harmonic in pipes that the frequency increases a certain amount (the fundamental frequency- and that in pipes closed at one end skips the even harmonics). However I also know that frequency is inversely proportionate to wavelength. So each successive harmonic has a smaller wavelength. But since there's a limit (I assume) to how small a wavelength can be, does each pipe have its own limit in terms of the number of harmonics that can be made in it?


Homework Equations


v= wavelength * frequency


The Attempt at a Solution


As I wrote above, I'm guessing there is a limit- like the highest harmonic is the one with the lowest non-zero wavelength (that will be the highest frequency), but I'm not sure if my class is oversimplifying it, and really there are exceptions or something
 
Physics news on Phys.org
welcome to pf!

hi eknox123! welcome to pf! :wink:
eknox123 said:
… frequency is inversely proportionate to wavelength. So each successive harmonic has a smaller wavelength. But since there's a limit (I assume) to how small a wavelength can be, does each pipe have its own limit in terms of the number of harmonics that can be made in it?

i suppose that when you get near the molecular level, the random thermal vibrations predominate, and the equations stop working, and so you can't have wavelengths shorter than that …

but I'm guessing that's a lot higher-pitched than any ear can hear! :smile:
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 2 ·
Replies
2
Views
5K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
9
Views
18K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 5 ·
Replies
5
Views
6K
  • · Replies 3 ·
Replies
3
Views
7K
  • · Replies 3 ·
Replies
3
Views
2K