June 2023 1 20 Report
Найдите, какая доля атомов радиоактивного изотопа кобальта распадается за 144 дня, если период его полураспада 72 суток. Ответ выразить в процентах.
а) 25 %
б) 50 %
в) 100 %
г) 75 %
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