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
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a
14.43 sec
b
7.21 sec
c
5 sec
d
10 sec
answer is B.
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Detailed Solution
In 10 sec, number of nuclei has been reduced to one fourth (25% to 6.25%).Therefore its half life is T1/2 = 5 sec.