Conceptual Physics (12th Edition)

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

Chapter 30 - Reading Check Questions (Comprehension): 26


The photons emitted by a laser are coherent. They have a single frequency, and are in phase with each other. Light from an incandescent lamp consists of a spectrum of photons that are emitted with random phase differences between them.

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This is discussed on page 575.
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