Answer
$$1.73$$
Work Step by Step
From part (a)
$$\Delta p_{r} / \Delta p_{m}=2 \cos (\phi / 2) .$$
When $\phi=\pi / 3,$
$$ \Delta p_{r} / \Delta p_{m}=2 \cos (\pi / 6)=\sqrt{3}=1.73$$
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 512: 88c
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