Half-Life Graph Practice

If you have 100 grams of a radioactive isotope, with a half life of 10 years, how many half lives will have passed in 40 years.

• 1
• 2
• 3
• 4

If you have 100 grams of a radioactive isotope, with a half life of 10 years, how much of the isotope will you have after 10 years?

• 10 grams
• 50 grams
• 75 grams
• 100 grams

If you have 100 grams of a radioactive isotope, with a half life of 10 years, how much of the isotope will you have after 20 years?

• 25 grams
• 50 grams
• 75 grams
• 100 grams

This graph shows the radioactive decay curve for Iodine-131. This radioactive isotope is used in medicine to help diagnose issues with the thyroid such as cancer and hyperthyroidism. What percent of the radioisotope remains after 32 days?

• 100%
• 25%
• 10%
• 5%

This graph shows the radioactive decay curve for Iodine-131. This radioactive isotope is used in medicine to help diagnose issues with the thyroid such as cancer and hyperthyroidism. What percent of the radioisotope remains after 8 days?

• 100%
• 75%
• 50%
• 25%

This graph shows the radioactive decay curve for Iodine-131. This radioactive isotope is used in medicine to help diagnose issues with the thyroid such as cancer and hyperthyroidism. What is the half-life of Iodine-131?

• 8 days
• 16 days
• 24 days
• 40 days

The following graph shows the radioactive decay curve for Carbon-14. This radioisotope is used by geologists to date fossils of once living organisms. According to the graph, what is the approximate half-life of carbon-14?

• 5.7 years
• 5,700 years
• 10,000 years
• 1,000,000 years

The following graph shows the radioactive decay curve for Carbon-14. This radioisotope is used by geologists to date fossils of once living organisms. Approximately how much carbon-14 is left after 22,800 years?

• 10 grams
• 5 grams
• 1 gram
• 0 grams

The graph shows the relationship between parent and daughter isotopes. How many half-lives have passed when the amount of parent isotope equals the amount of daughter?

• 1
• 2
• 3
• 4

The graph shows the relationship between parent and daughter isotopes. How many grams of parent isotope is left after 3 half lives?

• 85,000
• 5,000
• 50,000
• 10,000