A.) Natural potassium contains 40K, which has a half-life of 1.277 ✕ 109 y. What mass of 40K in a person would have a decay rate of 4140 Bq? =____g B.) What is the fraction of 40K in natural potassium, given the person has 140 g in his body?

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Chapter10: Nuclear Physics
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Problem 45P: (a) Calculate the energy released in the a decay of 238U . (b) What fraction of the mass of a single...
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A.) Natural potassium contains 40K, which has a half-life of 1.277 ✕ 109 y. What mass of 40K in a person would have a decay rate of 4140 Bq?
=____g

B.) What is the fraction of 40K in natural potassium, given the person has 140 g in his body? 

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