GCSE Physics – Calculating half life

Last updated: 26/03/2021
OCR Gateway GCSE Science – Physics higher Radioactive emissions GCSE Physics – Calculating half life

Learning Objectives

-I can define half-life
-I can calculate half-life

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15
  16. 16
  1. Current
  2. Review
  3. Answered

  1. What type of process is radioactive decay?

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.

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

    • 1.
    • 2.
    • 3.
    • 4.