Natural uranium is 0.7200% 235U and 99.27% 238U. What were the percentages of 235U and 238 U in natural uranium when Earth formed 4.5 x 10⁹ years ago, respectively? percentage 235U percentage 238 U % %

Q: Natural uranium is 0.7200% 235U and 99.27% 238U . What were the percentages of 235U and 238U in…

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Q: The amount of radioactive 40K in a 70kg person is approximately 5000Bq. A) what is the number (N) of…

A: mass of person (m) = 70 kg Activity (A)  = 5000 Bq Half life of K40 = 1.25×109 years

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