you have 80 grams of a radioactive kind of tellurium. how much will be left after 8 months if its half…

Explanation:

Step1: Calculate number of half - lives

The half - life is 2 months and the time elapsed is 8 months. The number of half - lives $n=\frac{8}{2}=4$.

Step2: Use the radioactive decay formula

The formula for radioactive decay is $A = A_0\times(\frac{1}{2})^n$, where $A_0$ is the initial amount and $n$ is the number of half - lives. Here, $A_0 = 80$ grams and $n = 4$. So $A=80\times(\frac{1}{2})^4$.

Step3: Calculate the remaining amount

$(\frac{1}{2})^4=\frac{1}{16}$, and $80\times\frac{1}{16}=5$.

Answer:

5