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Grade 11 Radioactivity & Half-Life Worksheet with Answers
Grade 11 (US) · Year 12 (UK) · Class 11 (India) · Science
Unit 4: Nuclear PhysicsRadioactivityNGSS HS-PS1-8
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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Practice Sheetaethelsystems.comRadioactivity & Half-Life
Grade 11 · Science
Name
Class
Date
Learning goal: Radioactivity · NGSS HS-PS1-8
Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.
A 1000 g sample has a half-life of 20 days. How much remains after 40 days?
Answer: 250 g
RememberHalf-life
- 1
A 160 g sample has a half-life of 5730 years. How much remains after 5730 years?
- 2
A 640 g sample has a half-life of 12 days. How much remains after 24 days?
- 3
A sample with a half-life of 12 days drops from 160 g to 80 g. How much time has passed?
- 4
A 640 g sample has a half-life of 10 days. How much remains after 20 days?
- 5
A 200 g sample has a half-life of 5730 years. How much remains after 5730 years?
- 6
A 640 g sample has a half-life of 5730 years. How much remains after 17190 years?
- 7
A 320 g sample has a half-life of 12 days. How much remains after 12 days?
- 8
A 200 g sample has a half-life of 12 days. How much remains after 12 days?
- 9
A 160 g sample has a half-life of 12 days. How much remains after 24 days?
- 10
An 80 g sample has a half-life of 30 days. How much remains after 90 days?
- 11
A sample with a half-life of 5730 years drops from 80 g to 10 g. How much time has passed?
- 12
A 200 g sample has a half-life of 5 days. How much remains after 10 days?
★ Challenge corner for fast finishers
You are in a closed room with a candle, a match and a lamp. What do you light first?
How did I do?
Teacher's comments
Free printable worksheets with answer keys · aethelsystems.com/worksheets/science/11/half_life
Answer key — Radioactivity & Half-Life (Grade 11)
- 1.80 g
- 2.160 g
- 3.12 days
- 4.160 g
- 5.100 g
- 6.80 g
- 7.160 g
- 8.100 g
- 9.40 g
- 10.10 g
- 11.17,190 years
- 12.50 g
- ★the match
Answer key (click to show)
- 1.80 g
- 2.160 g
- 3.12 days
- 4.160 g
- 5.100 g
- 6.80 g
- 7.160 g
- 8.100 g
- 9.40 g
- 10.10 g
- 11.17,190 years
- 12.50 g
- ★the match (challenge corner)
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