Suppose you have 100 g of radioactive plutonium-239 with a half-life of 24,000 years. How many grams will remain after (a) 12,000 years (b) 24,000 years (c) 96,000 years?
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after 24000 yrs 50g will be left.......after 96000 yrz grams left will be 12.5 grams.....and they not decay after 12000 yrs since half life is 24000 yrs not 12000 yrs
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