Answer
$y_m = 3.0~mm$
Work Step by Step
On the graph, we can see that when the waves are sent in phase, then the amplitude of the resultant wave is $y' = 6.0~mm$
Therefore, $y_m = 3.0~mm$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 16 - Waves-I - Problems - Page 477: 72a
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