If a material has a half-life of 24 hours,how long do you have to wait until the amount of radioisotope is 1/4 its original amount?
A)12 hours
B)24 hours
C)48 hours
D)72 hours
E)practically forever,but it may be safe by then

Question

Quizplus · Accepted Answer

To reach 1/4 of its original amount, a material must go through two half-lives. Since one half-life is 24 hours, two half-lives would be 48 hours.

If a Material Has a Half-Life of 24 Hours,how Long