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__ __________ '_ _ ' '___' __ ____ ___ " ___'______l _______U 37. Suppose that two coherent, Spherical sound sources, 1 and 2, each generate the same amount of power P. The distance be- tween the sources is 2). Point R is on a line of maximum de- structive interference, and the distance between R and source 1 is equal to 9A. Point Q is on a line of maximum constructive interference, and the distance between Q and source 1 is 6A. Obtain expressions for the intensity at points R and Q. on