Conceptual Physics (12th Edition)

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

Chapter 19 - Think and Explain: 73

Answer

The frequency is doubled.

Work Step by Step

The wave speed v is frequency multiplied by wavelength. $$v = f \lambda $$ In this example, the wavelength is halved, so the frequency f is doubled. Their product remains the same because the wave speed doesn't change.
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