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A source contains two phosphorous radio ...

A source contains two phosphorous radio nuclides `""_(15)^(32)P (T_(1//2) = 14.3d)` and `""_(15)^(33)P(T_(1//2) = 25.3d)`. Initially, 10% of the decays come from `""_(15)^(33)P`. How long one must wait until 90% do so?

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209 d
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