Answer
$L = 0.25~\lambda$
Work Step by Step
We can see that the path difference is $2L$
We can find the smallest value of distance $L$ that puts A and B exactly out of phase:
$2L = 0.5~\lambda$
$L = 0.25~\lambda$
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 17 - Waves-II - Problems - Page 511: 77
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