Answer :
Answer:
- a. one half-life
- b. three half-lives
- c. two half-lives
Explanation:
The number of half-lives elapsed, n, is calculated dividing the time by the half-life time:
- n = time / half-life time
a. A sample of Ce-141 with a half-life of 32.5 days after 32.5 days
- n = 32.5 days / 32.5 days = 1 half-life
b. A sample of F-18 with a half-life of 110 min after 330 min
- n = 330 min / 110 min = 3 half-lives
c. A sample of Au-198 with a half-life of 2.7 days after 5.4 days
- n = 5.4 days / 2.7 days = 2 half-lives