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(25 pts) The half-life for the process 238U ---...--> 206Pb is 4.5 x 109 yr. A mineral sample contains 85.0 mg of 238U and 10
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this is a radioactive decay so A- Aekt A= amount at time t = 85 mg A=Initial amount - 96.40mg k= sate Constant - lng tyy lu2radioactivity - ON 2.9x109 dt 8 8.2 x 10 x 365x24x60x60 - 2.98 1019 s 9.59% 1016 1-1 2x1035) =H2 103 Bacaurel

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