Answer
B, A, C, D.
Work Step by Step
The beat frequency is the difference in the frequencies given. In the order BACD, the differences are 6 Hz, 4 Hz, 3 Hz, and 2 Hz.
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 Rank - Page 389: 42
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