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The half-lives of radio isotypes P^32 an...

The half-lives of radio isotypes `P^32` and `P^33` are 14 days and 28 days respectively. These radioisotopes are mixed in the ratio of 4:1 of their atoms. It the initial activity of the mixed sample is 3.0 mCi, find the activity of the mixed isotopes after 60 years.

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The correct Answer is:
`0.205 mCi`
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