Answer:
D. 1/16
Explanation:
The half-life is the time it takes for an amount of radioactive material to decay by half. The half-life equation is:
A = P (1/2)^(t / T)
where A is the final amount,
P is the initial amount,
t is time,
and T is the half-life.
Given t = 14 and T = 3.5:
A = P (1/2)^(14 / 3.5)
A = P (1/2)^(4)
A = P (1/16)
A/P = 1/16
After 4 half-lives, the remaining sample will be 1/16 of the original.
