Nuclear Physics and RadioactivityHard
Question
The half life of a radioactive element is 30 days, in 90 days the percentage of disintegrated part is :-
Options
A.13.5%
B.46.5%
C.87.5%
D.90.15%
Solution
90 days → 3 half lives, left 
i.e. 12.5 %
Disintegrated = 100 - 12.5 = 87.5 %
i.e. 12.5 %Disintegrated = 100 - 12.5 = 87.5 %
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