Conceptual Physics (12th Edition)

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

Chapter 30 - Think and Explain: 38

Answer

See below.

Work Step by Step

The red light from the neon tube is not monochromatic, and contains multiple lines in its emission spectrum, most of them reddish. Look up "neon emission spectrum" in your favorite search engine. Light from a helium-neon laser is monochromatic - of one color - and will have just one line in its emission spectrum. Look up "HeNe laser emission spectrum" in your favorite search engine.
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