Conceptual Physics (12th Edition)

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

Chapter 30 - Think and Explain: 64

Answer

See below.

Work Step by Step

Photons emitted in the laser beam are coherent. They are in phase and move in the same direction. In contrast, photons emitted by the hot tungsten filament in an incandescent lamp are incoherent, and move in many directions.
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