Find for how many years field will be contaminated


Radioactive strontium 90Sr has been deposited in the large field by acid rain. If enough amounts make their way through food chain to humans, bone cancer can result. It has been found that radioactivity level in field is 2.5 times safe level S. 90Sr decays according to given formula, where A0 is amount currently in field and t is time in years.

A=A0e-0.0239·t

Find for how many years field will be contaminated?

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Mathematics: Find for how many years field will be contaminated
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