Answer
$41.8ps$
Work Step by Step
We know that
$t_4=(\frac{L}{c})(n_9+2n_6+n_5)$
We plug in the known values to obtain:
$t_4=(\frac{0.002}{3\times 10^8})\times(1.60+2\times 1.61+ 1.45)=41.8ps$
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 35 - Interference - Problems - Page 1080: 99d
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