Conceptual Physics (12th Edition)

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

Chapter 32 - Think and Explain: 27


The two amounts of energy are the same.

Work Step by Step

When an electron drops to a lower energy level, it loses energy, which it emits in the form of a photon. That exact same amount of energy is needed to excite the electron from the lower-energy state to the higher-energy state.
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