Answer
693 hours.
Work Step by Step
Using the formula $t_{\frac{1}{2}} = 0.693/k$, we find that the half life is $\frac{0.693}{1*10^-3}$ = 693 hours.
Chemistry 9th Edition
by Zumdahl, Steven S.; Zumdahl, Susan A.
Published by
Cengage Learning
ISBN 10:
1133611095
ISBN 13:
978-1-13361-109-7
Chapter 19 - The Nucleus: A Chemist's View - Exercises - Page 920: 25
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