College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 22 - Problems - Page 866: 66


The time delay was 2.56 seconds.

Work Step by Step

We can use $384,400~km$ as the distance between the Earth and the moon. We can find the time for EM waves to travel twice this distance: $t = \frac{2d}{c}$ $t = \frac{(2)(3.844\times 10^8~m)}{3.0\times 10^8~m/s}$ $t = 2.56~s$ The time delay was 2.56 seconds.
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