Krypton-85 has a half-life of 10 years. What percentage of 85Kr produced from nuclear testing in 1959 still remains today?
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The half life formula: A = Ao(2^(-t/h) whereAo = original amtt = timeh = half life of the materialA = resulting amt
so, A=Ao(2^(-50/10))/Ao*100=3.125 % ~ 3.13 % Answer
Given Half life, t1/2=10yrs
Now let [Kr]0 be initial concentration in 1959, and [Kr] be conc today.
thus % remaining in 2014 is 2.2%
If the ques would have been solved in 2009:
Percent remaining=3.13% Answer
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