Half-Life Calculations and Concepts
A Grade 12 Science worksheet covering half-life calculations, definitions, and applications of radioactive decay.
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Half-Life Calculations and Concepts
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Read each question carefully and provide accurate answers. Show all your work for calculation problems.
1. What is the definition of half-life in the context of radioactive decay?
The time it takes for a radioactive substance to completely decay.
The time it takes for half of the initial quantity of a radioactive substance to decay.
The time it takes for a radioactive substance to become stable.
The rate at which a radioactive substance emits radiation.
2. If a radioactive isotope has a half-life of 10 years, how much of a 100g sample will remain after 30 years?
50g
25g
12.5g
6.25g
3. The decay of radioactive isotopes follows an decay pattern.
4. Carbon-14 dating is used to determine the age of materials.
5. Explain the importance of half-life in medical applications, such as diagnostic imaging or radiation therapy.
6. A sample of Iodine-131 has an initial activity of 800 Bq. If its half-life is 8 days, calculate the activity of the sample after 24 days.
7. The half-life of a radioactive isotope is affected by temperature and pressure.
True
False
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