Conceptual Physics (12th Edition)

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

Chapter 31 - Think and Discuss: 70

Answer

The slower electron has the longer de Broglie wavelength.

Work Step by Step

Momentum is p = mv, so the twice-as-fast electron has twice the momentum of the other. The de Broglie wavelength is h/p, so the slower electron, with half-as-much momentum p, has twice the wavelength of the faster electron.
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