Answer
180$^o$ is half a cycle.
Work Step by Step
One wavelength $\lambda$, or one full cycle, corresponds to 360 degrees.
Half of a wavelength, $\lambda/2$, is half a cycle, and corresponds to 180 degrees.
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 11 - Oscillations and Waves - Search and Learn - Page 327: 4
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