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Americium-243 Has a Decay Constant of 9

Question 80

Multiple Choice

Americium-243 has a decay constant of 9.39 × 10^-5 years^-1. How long will it take for a sample of americium to lose one-third of its nuclei?

A) 2960 s
B) 10.6 × 10³ years
C) 4.32 × 10³ years
D) 6.44 × 10³ years
E) 7.84 × 10³ years

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