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A sample originally contains 16 grams of a radioactive isotope. After 36 days, 14.8 grams of the isotope remain in the sample.

What is the half-life of the isotope?

Enter your answer in the box. Round your answer to the nearest day.

 Dec 17, 2019
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14.8 = 16 e-k(36)       Solve for   k = .002165598

 

8   = 16 e-.002165598 t      Solve for t = t1/2 = 320 days

 Dec 17, 2019

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