InterviewSolution
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InterviewSolution
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An analysis of the rock shows that the relative number of `Sr^(87)` and `Rb^(87) (t_(1//2)=4.7 xx10^(10)` year) atoms is 0.05 . What is the age of the rock? Assume all the `Sr^(87)` have been formed from `Rb^(87)` only |
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Answer» `(.^(87)Rb)/(.^(87)Sr) = (x)/(y) = (1)/(0.052)` `(x)/(x + y) = (1)/(1.052)` `(N)/(N_(0)) = (1)/(1.052)` `lambda = (2.303)/(t) log_(10) (N_(0))/(N)` `(0.693)/(4.7 xx 10^(10)) = (2.303)/(t) = (2.303)/(t) log_(10) 1.052` `t = 3.43 xx 10^(9)` years |
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