SOLUTION: the half life of radium is 1690 years. if 60 grams are present now, how much will be present in 670 years?

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Question 812496: the half life of radium is 1690 years. if 60 grams are present now, how much will be present in 670 years?
Answer by josgarithmetic(39616)   (Show Source): You can put this solution on YOUR website!
Basic General Model,








, close to 31.7 grams.... This is a mistake...

CHECK:



as the constant k. Believing this to be a more correct value, you should find
, close to 45.4 grams. The work shown above "CHECK:" contains a mistake.

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