Will a longitudinal wave propagate “forever” in a tube?
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I understand that the wave will lose energy due to "friction" between the, lets say, water molecules, but in my mind at least the biggest loss of energy in a wave is normally the dispersion of it. What I mean by this is if you drop a stone in a pond the wave ripples outwards and is spread out so it loses energy very quickly. But in a tube this doesn't happen. So my question is: if you send a pulse through a pipe, if we discount the "friction" between molecules, will the wave go on forever?
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