A radioisotope has a half-life of 7.5 hours. How many half lives have occured after 67.5 hours?
a
7 half-lives
b
8 half-lives
c
9 half-lives
d
10 half-lives
1 answer
c. 9 half-lives
a
7 half-lives
b
8 half-lives
c
9 half-lives
d
10 half-lives
1 answer