Radioactive Decay: Americium-243 has a decay constant of 9.39 × 105 years-1. How long will it take for a sample of americium-243 to lose one-third of its nuclei?
A. 2960 s
B. 10.6 × 103y
C. 4.32 × 103 y
D. 6.44 × 103 y
E. 7.84 × 103 y
Answer: C
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Indicate whether the statement is true or false
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