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Question

The half-life of a radioactive decay is x times its mean life. The value of x is
  1. 0.3010
  2. 0.6930
  3. 0.6020
  4. 10.6930

A
0.6930
B
0.6020
C
10.6930
D
0.3010
Solution
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We have the relations:
λ=1tmean
λ=ln2thalf
Equating the two:
thalf=ln2tmean
thalf=0.693tmean
Hence, x=0.693

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