7. It takes 1.31 billion years for radioactive potassium-40 to drop to half its original size. How much of a 10 gram sam
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7. It takes 1.31 billion years for radioactive potassium-40 to drop to half its original size. How much of a 10 gram sam
7. It takes 1.31 billion years for radioactive potassium-40 to drop to half its original size. How much of a 10 gram sample of potassium-10 would be left after 4 billion years?
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