Half-Life - Calculation Questions

What is the definition of half-life in nuclear physics?

• The time required for all radioactive atoms to decay

• The time required for half of the radioactive atoms to decay

• The time required for a quarter of the radioactive atoms to decay

• The time required for three-quarters of the radioactive atoms to decay.

Which of the following is NOT an application of half-life?

• A) Radioactive dating

• B) Medical treatments

• C) Nuclear waste management

• D) Cooking food

Calculate the remaining amount of a 200-gram sample of a radioactive substance with a half-life of 10 days after 30 days.

• 100 grams

• 50 grams

• 25 grams

• 12.5 grams

Fill in the blank: The process of determining the age of ancient artifacts using radioactive isotopes is called ____.

• Medical treatment

• Radioactive dating

• Nuclear waste management

• Chemical analysis

Fill in the blank: After 2 half-lives, a 100-gram sample of a radioactive substance will reduce to ____.

• 75 grams

• 50 grams

• 25 grams

• 12.5 grams

What is the half-life of a radioactive isotope if 500 grams reduce to 62.5 grams in 30 years?

• 5 years

• 10 years

• 15 years

• 20 years

The decay process of radioactive material continues ____, but the rate of decay slows down over time.

• indefinitely

• temporarily

• rapidly

• slowly

Half-life is a fundamental property of radioactive isotopes and is essential for understanding their ____.

• color

• behavior

• weight

• size

A sample contains 500 grams of a radioactive isotope with a half-life of 10 years. How much will remain after 30 years?

• A) 125 grams

• B) 62.5 grams

• C) 250 grams

• D) 31.25 grams

What is the remaining amount of a 500g sample of a radioactive isotope after 3 half-lives?

• 250g

• 125g

• 62.5g

• 31.25g