What conditions are necessary for resonance of sound waves in a tube?
- KesLv 71 decade agoFavorite Answer
Sound waves are resonant even within a trumpet or trombone that are somewhat coiled. Because sound travels in air about 1,100 feet per second the length (but not taper) determines how many sound waves can travel from mouthpiece to bell (outward) and back to mouthpiece (inward) per second (resonating with lip vibrations). The resonance of different harmonics are affected by the amount and location of tapered and un-tapered tubing of varied diameters and most musicians can distinguish between the sounds of a trumpet, cornet, or flugelhorn playing the same pitch (with the same length of tubing). The tubing also has end effects and the nature of the bell alters the effective length of the tubing.
Saxophones and clarinets sound different playing the same pitch because the path of the saxophone is slightly conical while the clarinet has a more constant bore. The difference helps or hinders certain harmonics associated with the given resonant length of the path (which is interrupted by opening a keyhole near or far from the mouthpiece).
The fundamental (lowest natural frequency) will depend on whether the tube behaves as if it is open at both ends or closed at one end.
- gooberLv 71 decade ago
The sound wave traveling in one direction of the tube reflects off the end and travels back toward the source of the sound. If it arrives in phase with the phase of source that is making the sound, the tube is resonant.
- 5 years ago
Sound waves are the result of differences in air pressure, so we can't see them directly any more than we can see wind. However, one way to -visualize- sound waves would be to use a microphone to convert the differences in pressure to an electrical signal. The electrical signal could then be observed on an oscilloscope (which is essentially the same tool that hospitals use to monitor a patient's heart beat).