Homework Answers
Half- life = 3.83 days
31 days/3.83 days = 8.093 half-life
Now we know that
After 1 half-life fraction of amount left = 1/2
After 8.093 half-life fraction left = (1/2)^8.093
atoms left = 3.0*10^7*(1/2)^8.093 = 109871.613 atoms = 1.09*10^5 atoms
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