Conceptual Physics (12th Edition)

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

Chapter 33 - Think and Solve: 33

Answer

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.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.