GCSE Physics – Half-life

Last updated: 18/06/2020
WJEC GCSE Science – Physics higher Half-life GCSE Physics – Half-life

Learning Objectives

-I can define the term half-life
-I can relate half-life to radioactive decay
-I can determine half-life from graphic or mathematical information

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  1. Current
  2. Review
  3. Answered

  1. What type of process is radioactive decay?

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  2. What does the half-life involve?

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  3. What is half-life of a radioactive isotope?

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  4. How else can half-life of a radioactive isotope be defined?

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  5. What is the range of half-life of radioactive isotopes?

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  6. Why do we use large sources to measure half-life?

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  7. What type of graph will a non-radioactive nuclei vs time graph be?

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  8. What type of graph will an activity vs time graph be?

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  9. What type of graph will a count rate vs time graph be?

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  10. How do we express the percentage remaining after 2 half lives?

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  11. How do we express the percentage remaining after 3 half lives?

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  12. What is the half-life of a sample where activity drops from 2 Bq to 0.02 Bq in 21 days?

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  13. If it takes 2 days for activity to drop from 10,000 Bq to 2,500 Bq what is the half life?

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  14. If it takes 6000 years for activity to drop from 100,000 Bq to 50,000 Bq what is the half life?

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  15. If it takes 160 years for activity to drop from 32,000 Bq to 2,000 Bq what is the half life?

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  16. What is the half-life of a sample where activity drops from 1,200 Bq to 300 Bq in 10 days?

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  17. What is the half-life of a sample where activity drops from 1,200 Bq to 600 Bq in 6 days?

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  18. What is the half-life of a sample where activity drops from 1,200 Bq to 75 Bq in 4 days?

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  19. What is the half-life of a sample where activity drops from 10 Bq to 1.25 Bq in 9 days?

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  20. The half-life of a plutonium isotope is 5 years. How much of 100g of plutonium will be left after 15 years?

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