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in Physics by (24.7k points)
At a given instant there are `25 %` undecayed radioactive nuclei in a same. After `10 sec` the number of undecayed nuclei reduces to `6.25 %`, the mean life of the nuclei is.
A. 14.43 sec
B. 7.21 sec
C. 5 sec
D. 10 sec

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