Answer
The wavelength increases.
Work Step by Step
The wave speed is frequency multiplied by wavelength.
$$v = f \lambda $$
If frequency decreases, the wavelength increases. Their product remains the same because the wave speed doesn't change.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 19 - Think and Explain - Page 371-372: 52
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