Conceptual Physics (12th Edition)

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

Chapter 32 - Think and Explain: 43

Answer

Bohr’s correspondence principle says that if a new theory (quantum mechanics) is valid, it must give the same correct results as the old theory, i.e., it must correspond, in any area where the old theory (classical mechanics) has been verified.

Work Step by Step

Classical mechanics and quantum mechanics overlap for "medium-size" systems: a collection of particles that is large enough for classical physics to be applied, yet small enough that quantum effects are still observable. This happens when the de Broglie wavelength is small when compared to the dimensions of the system itself. This is discussed on page 611.
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