The half-life of silicon-32 is 710 years. If 80 grams is present now, how much will be present ijn 200 years?
I used A(t)=Ae^kt to solve for the rate (k).
A(710)=1/2Ae^k(710) 1/2A=Ae^k(710) 1/2=e^k(710) ln1/2=k710 ln1/2/710=k k=
And this is where I'm confused. Am I even starting in the right place?
Hint: $$m=m_02^{-t/T}\implies m=80\times2^{-200/710}=?$$