UI: A certain radioactive element has a half life of 20 years. How long will...

UI: A certain radioactive element has a half life of 20 years. How long will it take the activity to become 1/4 of its original?
(a)20 years(b)40 years(c)60 years (d)80 years?

In University of Ibadan
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Asked by Kaka Hanifah on 14th September, 2017

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