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Standard XII
Physics
Question

At a given instant , 60% of the radioactive nuclei in a sample are left undecayed. After 20s, 85% nuclei have disintegrated, mean life of nuclei
  1. 10s
  2. 6.93s
  3. 14.43s
  4. 28.86s

A
10s
B
14.43s
C
6.93s
D
28.86s
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Solution
Verified by Toppr

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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