Answer:
A) t = -3
Step-by-step explanation:
We have the expression and we have to find the value of t.
First we are going to reorder the expression:
Now we have to multiply each side by 2,
Subtract (-12) in both sides,
Divide both sides in 2,
The answer is option A) t = -3.
Answer:
Explanation:
<em>Half-life time</em> of a radioactive substance is the time for half of the substance to decay.
Thus, the amount of the radioactive substance that remains after a number n of half-lives is given by:
Where:
In this problem, you have that the half-live for your sample (polonium-210) is 138 days and the number of days elapsed is 330 days. Thus, the number of half-lives elapsed is:
Therefore, the amount of polonium-210 that will be left in 330 days is: