If the half-life of a material is 45 years, how much of it will be left after 100 years?
A) Iess than $1 / 2$ but more than $1 / 4$
B) more than $1 / 4$ but less than $1 / 2$
C) Iess than $1 / 4$ but more than $1 / 8$
D) Iess than $1 / 8$
E) more than $1 / 2$

Question

Quizplus · Accepted Answer

After 90 years (two half-lives), $1/4$ of the material remains. After 100 years, slightly less than $1/4$ remains, but more than $1/8$.

If the Half-Life of a Material Is 45 Years, How 1/21 / 21/2

If the Half-Life of a Material Is 45 Years, How $1 / 2$