Question

count A 5-5 Half-Life hboard Durses Isotope If you have 100 grams of a radioactive isotope with a half-life of 10 years: 1 1 point How much of the isotope will you have left after 10 years? lendar 1 49 Type your answer... Inbox 2 N 1 point How much of the isotope will you have left after 20 History years? M 3:05

Answer 1

According to the definition the Half-life is the time it takes for something to become half of the initial value.

If the isotope has a half-life of 10 years, means that after 10 years the amount of isotope you will have is half of the 100 g

After 10 years you will have 50g.

Now if another 10 years pass, then the initial value at 10 years will be 50 g and after another 10 years you will have 25 g.

After 20 years you will have 25 g.