Answer
20,000 years.
Work Step by Step
$log_2(13.6/1.2)$ = 3.502 half lives, 3.502 *5730 = 20,066 -> 20,000 years.
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 921: 38
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