ch42-p040 - 40. With T1/ 2 = 3.0 h = 1.08 104 s, the decay...

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61 0 9 5 (8.60 10 Ci)(3.7 10 Bq/Ci) 4.96 10 6.42 10 /s R N λ ×× == = × × . 40. With 4 1/2 3.0 h 1.08 10 s, T × the decay constant is (using Eq. 42-18)
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