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The half-life of a radioactive material is 3175 years. If there is 400 grams of the radioactive material today, when would there be 25 grams still radioactive?

 Nov 22, 2019
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25 =400 x 1/2^(y/3175), solve for y

 

0.0625 = 1/2^(y/3175)

 

y =12,700 Years - when 400 grams decays to 25 grams.

 Nov 22, 2019

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