Conceptual Physics (12th Edition)

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

Chapter 27 - Think and Explain: 58

Answer

Light travels faster through the upper atmosphere.

Work Step by Step

The air is less dense at higher altitudes, so there are fewer interactions between light and molecules. In other words, less dense air is closer to a vacuum, where light travels the fastest of all.
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