Conceptual Physics (12th Edition)

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

Chapter 33 - Think and Solve: 34

Answer

See below. Cesium-137 has a half-life of 30 years.

Work Step by Step

After one half-life, at t = 30 years, we are down to one-half the original amount. After two half-lives, at t = 60 years, we are down to one-quarter the original amount. After three half-lives, at t = 90 years, we are down to one-eighth the original amount. After four half-lives, at t = 120 years, we are down to one-sixteenth the original amount. This is discussed on page 625.
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