Conceptual Physics (12th Edition)

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

Chapter 30 - Think and Explain: 56

Answer

There is a time delay in each case.

Work Step by Step

After you jerk a spring-and-damper door open, it returns to its original state (i.e., it closes) over a much longer period of time. Similarly, when you excite a phosphorescent material, a time delay occurs before de-excitation takes place and the electrons return to their original state.
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