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The half-life of radium is 1620 years.  If a laboratory has 12 grams of radium, how long will it take before it has 4 grams of radium left?

 Oct 20, 2020
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4= 12 (1 - .5)^n                  n = # half lives

1/3 = .5n

n= 1.585

 

1.585 * 1620 =2567.64 years

 Oct 20, 2020

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