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Mathematics, 28.08.2021 04:20 oscarruiz

Select the correct answer. Plutonium–238 has a yearly decay constant of 7.9 × 10-3. If an original sample has a mass of 15 grams, how long will it take to decay to 12 grams?

(At = A0e-kt)

A.
3 years

B.
12.3 years

C.
28.3 years

D.
139.1 years

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