Questions
The half life of a radio active substance is 2h. After 4 hr fractional change in activity will be
a
12
b
34
c
58
d
23
detailed solution
Correct option is B
(2)A=Ao/2t/t1/2After 4 hr, A=Ao24/2 =Ao4∴ Fractional change =Ao−AAo=1−14=34Talk 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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