question 11(multiple choice worth 1 points) gt.02the table below shows the half - lives of four radioactive…

question 11(multiple choice worth 1 points) gt.02the table below shows the half - lives of four radioactive materials. radioactive material half - lives bismuth - 212 60.5 seconds sodium - 24 15 hours iodine - 131 8.07 days strontium - 90 29 years which of these materials will decay the slowest to one - fourth of its original amount? bismuth - 212 sodium - 24 iodine - 131 strontium - 90

question 11(multiple choice worth 1 points) gt.02the table below shows the half - lives of four radioactive materials. radioactive material half - lives bismuth - 212 60.5 seconds sodium - 24 15 hours iodine - 131 8.07 days strontium - 90 29 years which of these materials will decay the slowest to one - fourth of its original amount? bismuth - 212 sodium - 24 iodine - 131 strontium - 90

Answer

Explanation:

Step1: Understand half - life concept

To decay to one - fourth of its original amount, it takes 2 half - lives (since $\frac{1}{2}\times\frac{1}{2}=\frac{1}{4}$).

Step2: Compare half - life durations

We need to find the material with the longest half - life as it will take the most time to go through 2 half - lives. Bismuth - 212 has a half - life of 60.5 seconds. Sodium - 24 has a half - life of 15 hours. Iodine - 131 has a half - life of 8.07 days. Strontium - 90 has a half - life of 29 years. Clearly, 29 years is the longest half - life among them.

Answer:

Strontium - 90