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There is more than one isotope of natural uranium. If a researcher isolates 0.6 mg of...

There is more than one isotope of natural uranium. If a researcher isolates 0.6 mg of the relatively scarce 235U and finds this mass to have an activity of 72.0 Bq, what is its half-life in years? Please explain, other answers for this same question have been confusing about where their numbers came from.

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