Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

Chapter 14 - For Thought and Discussion - Page 262: 7



Work Step by Step

Intensity has to do with how much energy a wave carries per unit area. (Note, only the area perpendicular to the wave counts.) However, the fact that the intensity decreases does not mean that energy is being lost: rather, the spherical wave is simply spreading out.
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