Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 30 - Quantum Physics - Problems and Conceptual Exercises - Page 1075: 59

Answer

(a) decrease (b) II

Work Step by Step

(a) We know that $\lambda=\frac{h}{mv}$. This equation shows that wavelength is inversely proportional to speed and hence when the speed increases then the wavelength decreases. (b) We know that the best explanation is option (II) -- that is, as the momentum of the car increases, it follows that the de Broglie wavelength will decrease, because it is inversely proportional to the wavelength.
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