Answer
The 3 classes of instruments are grouped by how they produce sound: by vibrating strings, vibrating air columns, and a vibrating 2-D surface (i.e., percussion instruments).
Work Step by Step
This is discussed on pages 396-397.
Conceptual Physics (12th Edition) Clone
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
ISBN 13:
Chapter 21 - Reading Check Questions (Comprehension) - Page 401: 15
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