Conceptual Physics (12th Edition)

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

Chapter 33 - Think and Solve: 33


2 hours.

Work Step by Step

The amount of radioactive material remaining after eight hours is one-sixteenth of the original. After one half-life, we are down to one-half the original amount. After two half-lives, we are down to one-quarter the original amount. After three half-lives, we are down to one-eighth the original amount. After four half-lives, we are down to one-sixteenth the original amount. There have been four elapsed half-life periods in 8 hours. (8 hours)/4 = 2 hours.
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