Conceptual Physics (12th Edition)

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

Chapter 27 - Think and Explain: 50

Answer

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.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.