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Radioactive Isotopes and half life

  1. Jun 21, 2015 #1
    1. The problem statement, all variables and given/known data
    If a radioactive isotope ends with 55.5 g, and has a half-life of 2.5 days, how much was

    there 8.3 days ago?

    2. Relevant equations
    mf=mi(1/2^t/h)

    3. The attempt at a solution
    the answer i got was 554 g, is it correct?
     
  2. jcsd
  3. Jun 21, 2015 #2

    ehild

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    Homework Helper
    Gold Member

    yes, its is correct
     
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