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Question

10grams of a radioactive element is disintegrated to 1gram in 2.303minutes. The half-life (in minutes) of that radioactive element is:
  1. 10.693
  2. 6.93
  3. 1
  4. 0.693

A
10.693
B
6.93
C
1
D
0.693
Solution
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Using integrate reaction rate:
N=N0eλt,t=2.303=ln10
1=10eλt
110=eλln10
ln10=λln10
λ=1

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