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  4. The ratio of 235 U to 238 U in natural uranium deposits today is 0.0072. What was this ratio 2.0 × 109 year ago? The halflives of the two isotopes are 7.04 × 108 year and 44.7 × 108 year, respectively.

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Q. The ratio of ${ }^{235} U$ to ${ }^{238} U$ in natural uranium deposits today is $0.0072$. What was this ratio $2.0 \times 10^9$ year ago? The halflives of the two isotopes are $7.04 \times 10^8$ year and $44.7 \times 10^8$ year, respectively.

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Solution:

Correct answer is (d) $3.8 \%$