SOLUTION: the half life of radium is 1690 years. if 70 grams are present now, how much will be present in 450 years?

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Question 1057416: the half life of radium is 1690 years. if 70 grams are present now, how much will be present in 450 years?
Answer by stanbon(75887) About Me  (Show Source):
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the half life of radium is 1690 years. if 70 grams are present now, how much will be present in 450 years?
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A(450) = 70*(1/2)^(450/1690) = 70*0.83 = 58.2 grams
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Cheers,
Stan H.
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