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239 Pu is a nuclear waste byproduct with a half-life of 24,000 y. What fraction of the 239 Pu present today will be present

239 Pu is a nuclear waste byproduct with a half-life of 24,000 y. What fraction of the 239 Pu present today will be present in 1,000 y? a) 50% b) 92% c) 97% d) 86%

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