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The graph below shows radioactive decay of iodine.
SekphycP2q18b
Use the graph to determine the:-

  1. Fraction of the amount remaining after 16.2 days.
  2. Determine the half – life of iodine. 
  3. Mass remaining after 17 days

1 Answer

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  1. 180/400( approx.)
  2. T½ = 7500 -2500 = 5000 years
     
  3. No of halflifes = 15000/5000
    N1 =No(½)3
    100(½)3
    =12.5g
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