A source contains two phosphorus radionuclides, \( { }^{32} \mathrm{P} \) \( \left(T_{1 / 2}=14....

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A source contains two phosphorus radionuclides, \( { }^{32} \mathrm{P} \) \( \left(T_{1 / 2}=14.3 \mathrm{~d}\right) \) and \( { }^{33} \mathrm{P}\left(T_{1 / 2}=25.3 \mathrm{~d}\right) \). Initially, \( 10.0 \% \) of the decays come from \( { }^{33} \) P. How long must one wait until \( 95.0 \% \) do so?
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