Answer
c)
Work Step by Step
Intensity is given by $P/(4 \pi r^2)$. Thus, if r is 10 times as much, intensity will be 1/100 (which is 1%) as much. The answer is c.
Essential University Physics: Volume 1 (4th Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0-134-98855-8
ISBN 13:
978-0-13498-855-9
Chapter 14 - Section 14.3 - Waves on a String - Got It? - Page 257: 14.3
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