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Question

The t1/2 of a radioactive substance is 100sec. Its decay constant is:
  1. 6.93×103sec1
  2. 6.93×101sec1
  3. 6.93×104sec1
  4. 6.93×102sec1

A
6.93×102sec1
B
6.93×104sec1
C
6.93×101sec1
D
6.93×103sec1
Solution
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t1/2=100 sec

λ=ln 2t1/2=0.693100=0.00693sec1

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