Answer
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.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 20 - Think and Explain - Page 389-390: 58
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