42. We label the two isotopes with subscripts 1 (for 32P) and 2 (for 33P). Initially, 10% of the decays come from 33P, which implies that the initial rate R02= 9R01. Using Eq. 42-17, this means RNRN01101022021919===λλ. At time t, we have RRet1011=−λand et2022=. We seek the value of tfor which R1= 9R2(which means 90% of the decays arise from
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