Answer
$ x = 88.99 \ m$
Work Step by Step
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$
Essential University Physics: Volume 1 (3rd Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0321993721
ISBN 13:
978-0-32199-372-4
Chapter 14 - Exercises and Problems - Page 263: 58
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