SOLUTION: 6.8.9 Question Help
The​ half-life of radium is 1690 years. If 40 grams are present​ now, how much will be present in 440 ​years?
_______ grams
​(
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Question 1089273: 6.8.9 Question Help
The half-life of radium is 1690 years. If 40 grams are present now, how much will be present in 440 years?
_______ grams
(Do not round until the final answer. Then round to the nearest thousandth as needed.)
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39614) (Show Source): You can put this solution on YOUR website!
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If half life 1690 years, then ;
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Let p=40, t=440, find y.
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y=33 grams
Answer by ikleyn(52756) (Show Source): You can put this solution on YOUR website!
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The correct answer is 33 grams.
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