A sinusoidal wave is sent along a cord under tension, transporting energy at the average rate of Pavg,1. Two waves, identical to that first one, are then to be sent along the cord with a phase difference ? of either 0, 0.2 wave length, or 0.5 wave length. (A) With only mental calculation, rank those choices of ? according to the average rate at which the waves will transport energy, greatest first. (b) For the first choice of ?, what is the average rate in terms of P avg,1?
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