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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

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The correct Answer is:
C
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Knowledge Check

  • 80% of the radioactive nuclei are left undecayed in one day then % of nuclei left undecayed after two days will be:

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