4. A radioactive isotope has a half life of 40 years. If we started off with 10 mg of this isotope 15 years ago: a. Find an expression for the amount of the isotope that is still active using time t measured in years. A = Ac(4)£ b. How much of the isotope do we have at the present time? ALt) = f(x+h)- f(x) lim c. What is the present instantaneous rate of decay? Show a solution using the
4. A radioactive isotope has a half life of 40 years. If we started off with 10 mg of this isotope 15 years ago: a. Find an expression for the amount of the isotope that is still active using time t measured in years. A = Ac(4)£ b. How much of the isotope do we have at the present time? ALt) = f(x+h)- f(x) lim c. What is the present instantaneous rate of decay? Show a solution using the
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Transcribed Image Text:4. A radioactive isotope has a half life of 40 years. If we started off with 10 mg of this isotope 15 years ago:
a. Find an expression for the amount of the isotope that is still active using time t measured in years.
A = Ac(4)
Att)=Ad a)
%3D
b. How much of the isotope do we have at the present time?
AC 6) =1064)
ACE) =
f(x+h)- f(x)
lim
c. What is the present instantaneous rate of decay? Show a solution using the
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