Half-life is a fundamental concept in physics that describes the time required for half of the nuclei in a radioactive sample to decay. Understanding half-life is essential for grade 12 students as it forms the basis for interpreting radioactive decay processes, calculating remaining quantities of isotopes over time, and applying this knowledge to real-world contexts such as radiocarbon dating and nuclear medicine. The questions provided above cover key aspects of half-life, from its definition and mathematical relationships to practical applications and problem-solving.
By carefully studying these questions and their answer choices, students can reinforce their grasp of the concept, practice critical thinking, and enhance their readiness for national examinations. Engaging with these multiple-choice questions will help students confidently analyze decay problems, interpret half-life data, and apply formulas accurately—skills that are crucial for success in physics assessments.
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1. What is the half-life of a radioactive substance?
2. What happens to the number of radioactive nuclei after one half-life?
3. The half-life of a radioactive isotope is 4 hours. How much of a 16 gram sample remains after 8 hours?
4. If the half-life of a substance is 10 minutes, what fraction remains after 30 minutes?
5. The half-life of Carbon-14 is approximately 5730 years. This is mainly used in:
6. The decay constant (λ) is related to the half-life (T½) by which equation?
7. After three half-lives, what fraction of the original radioactive nuclei remain?
8. Which of the following best describes the half-life of a radioactive isotope?
9. A sample has a half-life of 5 years. How long will it take for 1/16 of the original amount to remain?
10. Which of these is NOT a use of half-life in science?
11. A radioactive isotope has a half-life of 1 hour. After 4 hours, what percentage of the original sample remains?
12. If a substance's half-life is very short, this means:
13. The activity of a radioactive sample is the number of decays per unit time. How does activity relate to half-life?
14. What is the half-life of a substance if after 10 hours only 25% of it remains?
15. If a radioactive substance has a half-life of 10 years, how much of a 100 g sample remains after 30 years?
16. Which factor does NOT influence the half-life of a radioactive isotope?
17. Which of these best represents the meaning of "half-life" in nuclear physics?
18. A sample has a half-life of 2 days. How much of a 100 g sample remains after 6 days?
19. The half-life concept is important in which of the following?
20. If the half-life of a radioactive isotope is known, what can be determined?
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