Recent content by hds123523000

thanks all you guys for discussion. i think i understand. the 81 percent is regarded to the total energy in the tube, not the input by the speaker. actually the 19 percent leakage equals the input. isn't it?

i mean, 81 percent is kept in the tube at the wavefront. the tube is accumulating energy even at its stable state and the peak should get higher and higher.

i think the sound wave is mechanic wave, like water wave, varying slow enough for microphone intead of light whose intensity is time averaged. so the signal that detected by the microphone is the amplitude directly. even though 81 percent isn't negligiable, is it? so we are back to the...

in you opinion, when we try to work out the resonance frequency, we should use the sound speed in the tube rather than outside the tube, right?

In terms of the energy dissipating, another interesting point will come out. if you have done this experiment, you will found that the ratio of the amplittude at the antinode site and the node side can easily reach 10 as i suggested in my previous post. that means the reflection can reach 0.9...

So, in your opinion, physically, what's the difference between the air inside the tube and outside?

my theory is that, if the reflection is more than 0, or in another words, if at the boundary reflection happens, it mean the energy don't go out of the tube completely, then the tube gain/accumulate some energy. what we are supposed to see is that the peak become higher and higher instead of a...

sorry for confusing. i just want to get the idea why the relection happens at the opening end and find that the current explanation seems not very convincing and self-explainary.

if i look at it as a boundary condition, i wouldn't expect it is a condition that is a smooth function instead of sudden function like in the case of a closed end. is it right? In terms of leaking, there is a interesting point i want to make. if it leaks, let's say the reflection rate is R...

any one knows why sound wave reflects at the opening end of the resonance tube? is the air inside the tube different from those outside. from the expriment, when the incident wave interference with the reflected one, the destructive point reachs almost zero showing that the reflected one has...

as far as i know, the velocity of the propagation of the electric field is the same as the speed of light so that electrons can sense it quickly and move slowly.

Meriz In your opinion, if I abandon the classic theory. Where is magnetic moment from physically in quantum theory? The possibility can generate magnetic moment? It is difficult to convince me in that way. Best

Hi, Sam Your reply is interesting and a little beyond my understanding. You think the megnetic can be generated without electron orbiting? I think everything is out of a physical reason. But what is the physical reason of that magic equation. You mentioned the semiclassical limit. I am...

Hi, Meir Achuz Can you explain your point 2 more deeply. For example, why it has such magnetic momentum but doest obey the classic orbit? Where this magnetic moment originally from?

ZapperZ, I think you spotted out more interesting points. Yes, we can't explain orbital angular momentum in a quantum concept. So, this is something you think unsolvable, at least now. Does everyone agree? Or I missed something? Thanks for suggestion.