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The half-life of radium is 1620 years.  If a laboratory has 20 grams of radium, how long will it take before it has 8 grams of radium left?

 Oct 6, 2020
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8 = 20 (1-.5)t      Where t = # of half lifes

 

t = 1.3219 half lifes

1.3219 x 1620 = 2141.5 yrs

 Oct 6, 2020
edited by ElectricPavlov  Oct 6, 2020

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