Answer
wave $4$
Work Step by Step
Since wave $4$ has the deepest valley out of all the three waves 2, 3, and 4; the sum of wave 1 and wave 4 at both of their troughs will result in the greatest valley when the waves are summed together.
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 - Questions - Page 471: 2a
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