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The half life of krypton-85 is 10.76 years. How much of the initial amount of 210 mg will be left in 3.5 years?

The formula is A = A₀1/2^t/h A is the final amount; A₀ is the initial amount;
       t = time; h = half life; The answer is A = 210(1/2)^3.5/10.76 = 167.61 mg

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