Answer
119 radians.
Work Step by Step
Use $\phi=(\frac{2\pi}{\lambda})(r_2-r_1)$ to relate the phase to the wavelength and the path difference.
$$\phi=(\frac{2\pi}{2.00cm})(524cm-486cm)=119 rad$$
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 35 - Interference - Problems - Exercises - Page 1181: 35.18
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