Conceptual Physics (12th Edition)

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

Chapter 20 - Think and Explain: 72

Answer

A harp is not as loud as a piano because its sound board is smaller and does not move as much air.

Work Step by Step

Both stringed instruments rely on a sound board, which is a surface that the strings vibrate against, and set into motion. The sound is made louder because the the vibrating sound board has a large surface, and moves a lot more air than the vibrating strings can move on their own. This is discussed on page 382.
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