Question

# A radioactive substance has a half life of 60 minutes. After 3 hours, the percentage of atom that have decayed would be12.5%87.5%8.5%25.1%

Solution

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

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