Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 35 - Think and Discuss: 89

Answer

See below.

Work Step by Step

Michelson and Morley thought that their experiment failed because they did not find differences in the speed of light, measured parallel and perpendicular to the Earth's motion. This null result was wholly unexpected. The reason for the "failure" is that the speed of light is constant for all observers.
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