Question

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?1. 48 hours2. 24 hours3. 72 hours4. 12 hours5. practically forever, but it may be safe by then

Answer 1

48 hrs

Step-by-step explanation:

If the original mass was x g

Then after 24 hours the mass remaining will be x / 2

After another 24 hours the mass remaining will be x/4 which is 1/4 of its original mass