Question

You have 80 grams of a radioactive kind of tellurium. How much will be left after 8 months if its half-life is 2 months?

Answer 1

$N(t)=N_0(\frac{1}{2})^{\frac{t}{t_{1/2}}}=80\cdot(\frac{1}{2})^{\frac{8}{2}}=5\space g.$