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At a given instant, 60% of the radioacti...

At a given instant, 60% of the radioactive nuclei in a sample are left undecayed. After 20 s, 85% nuclei have disintegrated , mean life of nuclei

A

10 s

B

6.93 s

C

14.43 s

D

12.86 s

Text Solution

Verified by Experts

The correct Answer is:
C
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