## Essential University Physics: Volume 1 (3rd Edition)

$x = 88.99 \ m$
We know that the intensity of the wave is inversely related to the square of the distance a person is from a wave. Thus: $1.5x^2 = (x+20)^2$ $0=-.5x^2 +40x +400$ $x = 88.99 \ m$
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