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A metal rod rests on supports in a tank of water. A sound pulse, of some...

A metal rod rests on supports in a tank of water. A sound pulse, of some initial intensity, is generated at one end of the rod. Assume that the sound cannot leave the rod except as a result of partial reflections at its ends; and that there is no loss of intensity otherwise. After 1 round trips, the pulse travels back along the rod for a second round trip. How many end-reflections have occurred?

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