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Question

A radioactive substance has a half life of 60 minutes. After 3 hours, the percentage of atom that have decayed would be
  1. 12.5%
  2. 87.5%
  3. 8.5%
  4. 25.1%


Solution

The correct option is B 87.5%
N=N0(12)tT1/2. Hence fraction of atoms decayed 
=1NN0=1(12)tT1/2=1(12)3×6060=78
In percentage it is 78×100=87.5%

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