Conceptual Physics (12th Edition)

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

Chapter 19 - Think and Explain - Page 371-372: 67


When a medium is vibrated at one point (e.g., shaking the end of a rope, dipping a finger in and out of a pool of water), that is the source of mechanical waves in the medium. When an electric charge shakes back and forth, it generates electromagnetic waves.
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