Questions
A sample has radioactive 4 x 1016 nuclei of half-life 10 days. The number of atoms decaying in 30 days is
a
3.9 x 1016
b
5 x 1015
c
1016
d
3.5 x 1016
detailed solution
Correct option is D
N=4 x 1016123010=12x 1016Atoms decayed =4 x 1016-12 x 1016=3.5 x 1016Talk 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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