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Solution: Radioactive plutonium-239 (t1/2 = 2.44 x 105 yr) is used in ...

Question

Radioactive plutonium-239 (t1/2 = 2.44 x 105 yr) is used in nuclear reactors and atomic bombs. If there are 4.00 x 102 g of isotope in a small atomic bomb, how long will it take for the substance to decay to 1.00 x 102 g? Hint: Radioactive decays follow first-order kinetics.

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