Question: According to one cosmological theory, when uranium was first generated in the early evolution of the universe following the big bang, the isotopes 235 U

According to one cosmological theory, when uranium was first generated in the early evolution of the universe following the “big bang,” the isotopes ²³⁵U and ²³⁸U were produced in equal amounts. Given the half-lives of 4.51 x 10⁹ years for ²³⁸U and 7.10 x 10⁸ years for ²³⁵U, calculate the length of time required to reach the present distribution of 137.7 atoms of ²³⁸U for each atom of ²³⁵U.

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Let Ng t and N t be the numbers of 238 U and 235 U atoms respectively at time t in billions of y... View full answer

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