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Question

At any instant the ratio of the amount of radioactive substances is 3 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances
  1. 1 : 1
  2. 3 : 2
  3. 2 : 1       
  4. 1 : 4


Solution

The correct option is B 3 : 2
By using N=N0(12)nN1N2=(N0)1(N0)2×(12)n1(12)n2=31×(12)2×2412(12)2×2416=32

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