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# At a given instant , 60% of the radioactive nuclei in a sample are left undecayed. After 20s, 85% nuclei have disintegrated, mean life of nuclei10s6.93s14.43s28.86s

A
10s
B
14.43s
C
6.93s
D
28.86s
Solution
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#### From the equation it is clear that half life if radioactive nuclei is to see,Mean life =1λ =10.693 =t1/20.693 =200.693 =28.86s∴ Mean life =28.86s.

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