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How to prove a wave is travelling ?
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[QUOTE="nrqed, post: 5491449, member: 15416"] I guess we are talking about waves traveling without changing shape (otherwise we have to discuss dispersion, group velocity vs phase velocity, etc). In general, if you have a function of the combination ##kx- \omega t## or of ##kx+ \omega t##, then you have a wave traveling to the right (or to the left in the second case) at a speed equal to ##v=\omega/k##. In other words, you can tell by using the following trick: if you set ##kx=\omega t## in the function and magically all dependence on x and t disappears, you have a wave traveling to the right without changing shape. If you set ##kx=-\omega t## in the function and magically all dependence on x and t disappears, you have a wave traveling to the left without changing shape. [/QUOTE]
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How to prove a wave is travelling ?
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