Questions
The activity of a sample is . Its half—life is 3 days. The activity will become after
a
12 days
b
7 days
c
18 days
d
21 days
detailed solution
Correct option is D
A=A012t/T1/2⇒5 x 10-6=64 x 10-512t/3 ⇒1128=12t/3⇒t=21 daysTalk to our academic expert!
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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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