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Grade 10 Radioactivity & Half-Life Worksheet with Answers

Grade 10 (US) · Year 11 (UK) · Class 10 (India) · Science

Unit 6: Going FurtherAdvanced: Physics PreviewNGSS HS-PS1-8Advanced

Calculating how much of a radioactive sample remains, and dating with half-lives. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Radioactivity & Half-Life

Grade 10 · Science

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Learning goal: Advanced: Physics Preview · NGSS HS-PS1-8

Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.

Example

A 400 g sample has a half-life of 12 days. How much remains after 12 days?

Answer: 200 g

RememberHalf-life

100%050%125%212.5%3half-livesAfter each half-life, half is left.amount left = start × (½)ⁿn = time ÷ half-life
  1. 1

    A sample with a half-life of 12 days drops from 400 g to 200 g. How much time has passed?

  2. 2

    A sample with a half-life of 5730 years drops from 400 g to 200 g. How much time has passed?

  3. 3

    A 200 g sample has a half-life of 20 days. How much remains after 20 days?

    200 g0?20days (half-life = 20)
  4. 4

    A 1000 g sample has a half-life of 20 days. How much remains after 40 days?

    1000 g020?40days (half-life = 20)
  5. 5

    A sample with a half-life of 20 days drops from 1000 g to 125 g. How much time has passed?

  6. 6

    A 640 g sample has a half-life of 30 days. How much remains after 90 days?

    640 g03060?90days (half-life = 30)
  7. 7

    A sample with a half-life of 20 days drops from 160 g to 80 g. How much time has passed?

  8. 8

    A sample with a half-life of 12 days drops from 320 g to 160 g. How much time has passed?

  9. 9

    A sample with a half-life of 10 days drops from 400 g to 100 g. How much time has passed?

  10. 10

    A 160 g sample has a half-life of 10 days. How much remains after 10 days?

    160 g0?10days (half-life = 10)
  11. 11

    A sample with a half-life of 5730 years drops from 320 g to 160 g. How much time has passed?

  12. 12

    A 640 g sample has a half-life of 5 days. How much remains after 10 days?

    640 g05?10days (half-life = 5)

★ Challenge corner for fast finishers

Does a kilogram of feathers weigh more than a kilogram of iron?

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Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/science/10/half_life

Answer key (click to show)
  1. 1.12 days
  2. 2.5,730 years
  3. 3.100 g
  4. 4.250 g
  5. 5.60 days
  6. 6.80 g
  7. 7.20 days
  8. 8.12 days
  9. 9.20 days
  10. 10.80 g
  11. 11.5,730 years
  12. 12.160 g
  13. ★no — they weigh the same (challenge corner)

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