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A radioactive isotope has a half life of...

A radioactive isotope has a half life of 5 yrs. How long will it take the activity to reduce to `3.125%`?

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The correct Answer is:
25 years
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MODERN PUBLICATION-NUCLEI-PRACTICE PROBLEMS
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  12. We are given the following atomic masses: ""(93)Pu^(238) = 238.04954...

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  13. In beta decay, ""(10)Ne^(23) is converted into ""(11)Na^(23). Calculat...

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