The discussion revolves around the emission of sound waves in organ pipes, specifically focusing on whether higher frequency harmonics are produced during intervals when the air jet is not contributing energy to the system. Participants explore the relationship between the fundamental frequency and the harmonic series, as well as the mechanisms driving sound production in this context.
The discussion is ongoing, with various interpretations being explored regarding the energy dynamics within the organ pipe. Some participants have offered insights into the role of resonance and the oscillation of air within the pipe, indicating a productive direction in understanding the problem.
There are assumptions regarding the behavior of the air jet and the nature of sound production in organ pipes that are being examined. The specific frequencies at which resonance occurs are also a point of discussion, highlighting the complexity of the system.
I think you are forgetting how the Organ pipe sounds. Remember resonance. The air can flick in and out at any rate at all, but you only get resonance with specific frequencies (fundamental and overtones), so you only hear specific frequencies sounding.crd2830 said:Homework Statement
Organ pipe sound is driven by a compressed air jet flicking alternately in and out of the pipe in step with the fundamental frequency. My question is whether sound waves of the higher frequency harmonic series are emitted during the intervals when the jet is outside of the pipe and not contributing energy to the system, and if so, what drives them?
Thank you.
Homework Equations
The Attempt at a Solution
Not sure how you mean that. As I hinted, it flicks in and out at the rate it does for a reason. Understanding that reason is key to answering the question.PeterO said:The air can flick in and out at any rate at all,
Please try to answer my question in post #2, even though you do not yet see the relevance.crd2830 said:The question is the energy source to drive the harmonic frequencies. If the jet flicks in and out of the organ pipe, adding energy only while flicking into the pipe, and if the fundamental frequency of the pipe were 110 Hz, then during each second there are one hundred and ten 4.5 ms gaps during which energy is not being added to the pipe. But during those 4.5 ms gaps, harmonic sound waves are being generated. For example, to sustain the harmonic frequency of 1100 Hz requires an energy pulse inside the pipe every 0.9 ms. Where is that energy coming from during the aforementioned gaps?
No, the jet does not initiate these events by itself.crd2830 said:each compression/rarefaction event initiated by the jet to transit the length of the pipe.