Conceptual Physics (12th Edition)

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

Chapter 20 - Think and Explain: 58


We can see the bell, so the experiment proves that electromagnetic waves (e.g., visible light) can travel through a vacuum. We can’t hear the bell, so sound waves do not travel through a vacuum, i.e., sound needs a medium to be transmitted.
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