Conceptual Physics (12th Edition)

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

Chapter 27 - Think and Explain - Page 517-518: 50


Water absorbs red light, so your poor, sunburned feet don't look as red when they are underwater.

Work Step by Step

Water molecules have a natural resonance frequency in the infrared region, and a little bit in the red region, so water preferentially absorbs those frequencies. This is discussed on pages 514-515.
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