Question 16

Question

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

Answer 1

To determine how many half-lives have occurred after 67.5 hours for a radioisotope with a half-life of 7.5 hours, you can use the following formula:

Number of half-lives = Total time elapsed / Half-life duration

Plugging in the values:

Number of half-lives = 67.5 hours / 7.5 hours = 9

So, the answer is:

c) 9 half-lives