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21. A source contains two species of phosphorous nuclei, 32P (T. = 14.3 d) and P (T, = 25.3 d). At time t = 0,

21. A source contains two species of phosphorous nuclei, 32P (T. = 14.3 d) and P (T, = 25.3 d). At time t = 0, 90% of the decays are from 15 32 p How much time has to elapse for only 15% of the decays to be from 32 P ? 15

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