Conceptual Physics (12th Edition)

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

Chapter 31 - Think and Discuss - Page 599: 69


Protons moving at the same speed as electrons have more momentum. The electrons have the longer wavelength.

Work Step by Step

Momentum is p = mv, so the larger-mass proton has more momentum. The de Broglie wavelength is h/p, so the electron, with smaller momentum p, has the longer wavelength.
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