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Chemistry, 29.03.2021 02:00 bks53

Lead-196 has a half-life of 37 minutes it decays into thallium-196 suppose a sample contains 20 atoms of lead-196 and 60 atoms of thallium-196 about how old is the sample. A. 37 minutes
B. 111 minutes
C. 74 minutes
D. 148 minutes

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