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  1. Apr 25, 2006 #1
    In 440 days, an unknown radioactive substance decays to 30 percent of its original amount.

    (a) What is the constant k in the form of solution y(t) = Aexp(kt)?


    First of all.... I dont even know what Aexp(kt) mean

    does it A^(kt) or what?!
  2. jcsd
  3. Apr 25, 2006 #2


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    Gold Member

    It means [tex]y(t)=Ae^{kt}[/tex]
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