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Plutonium decays with a half-life of 240...

Plutonium decays with a half-life of 24000 years. If plutonium is stored for 72000 years, what fraction of it remains ?

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`N/N_(0)=(1/2)^(t/T_(1/2))=(1/2)^(72000/24000)=(1/2)^(3)=1/8 impliesN=N_(0)/8`
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