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Question

Half-life of Bi210 is 5 days. If we start with 50,000 atoms of this isotope, the number of atoms left after 10 days is
  1. 5,000
  2. 25,000 
  3. 12,500
  4. 20,000


Solution

The correct option is C 12,500
We know that Nt=N0(12)t/T,
where t is time and T is half life.
Putting the values,
Nt=50000(12)10/5=12500

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