3. The ratio of 235U to 238U in natural uranium deposits today is 0.0072. What was this ratio 2 billion years ago if kno
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3. The ratio of 235U to 238U in natural uranium deposits today is 0.0072. What was this ratio 2 billion years ago if kno
3. The ratio of 235U to 238U in natural uranium deposits today is 0.0072. What was this ratio 2 billion years ago if known that the half-life of the two isotopes is 7.04 x 108 years and 4.47 x 10 years, respectively?
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