Environmental Science for AP* (2nd Edition)

Published by W. H. Freeman
ISBN 10: 1464108684
ISBN 13: 978-1-46410-868-6

Chapter 12 - AP Environmental Science Practice Exam - Section 1: Multiple Choice-Questions - Page 429: 9

Answer

C

Work Step by Step

Since Radioactive isotopes have a half life of 40 years, we simply multiple 4 half lives by 40 to get the answer of 160 years.
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