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"Tom Donaly" wrote:
[...] Most undergraduate physics texts have, or should have, discussions of vibrating strings. There's a good treatment of the subject in William C. Elmore's and Mark A. Heald's book _Physics of Waves_ published by Dover. If you wanted to get in an argument you could say that the energy on both sides of the node isn't traveling, but is merely alternating between potential and kinetic. Yes, I thought about that a bit before posting. It seems logical a plucked string sends a wave in both directions, where it is reflected and returns to create a standing wave. When it forms a standing wave, it seems reasonable to say the energy is alternating between potential and kinetic. But isn't that similar to what happens on a transmission line that is exactly some multiple of a quarter wavelength long? Such strings have loss (or you wouldn't be able to hear them). Loss is a taboo subject on this newsgroup because it makes wave behavior too hard to understand for the savants posting here. 73, Tom Donaly, KA6RUH Regards, Mike Monett |
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