Questions
The half-life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be
a
93.75%
b
75%
c
25%
d
6.25%
detailed solution
Correct option is A
Number half-lives in 20 min =n=205=4Fraction of material remains after four half lives =116Hence fraction that decays =1-116=1516=93.75%Talk to our academic expert!
Similar Questions
The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then
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