Conceptual Physics (12th Edition)

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

Chapter 30 - Reading Check Questions (Comprehension): 21

Answer

The primary excitation is by electron impact upon the atoms. The secondary excitation occurs because of photon impact.

Work Step by Step

This is discussed on pages 572-573.
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