Radioactivity and half-life Quiz
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5 questions, one answer each
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1. Which radiation is stopped by a sheet of paper?
- A. Gamma
- B. Beta
- C. Alpha
- D. All three
2. Radium-226 (atomic number 88) emits an alpha particle. What is the new nucleus?
- A. Mass number 222, atomic number 86
- B. Mass number 226, atomic number 89
- C. Mass number 224, atomic number 88
- D. Mass number 222, atomic number 90
3. A sample has a half-life of 2 hours and an activity of 64 counts per minute. What is its activity after 6 hours?
- A. 32
- B. 16
- C. 4
- D. 8
4. Which use of radioactivity depends on gamma rays passing through packaging?
- A. Sterilising sealed medical equipment
- B. Smoke detectors
- C. Dating wood
- D. Making nuclear fuel
5. Which is a source of natural background radiation?
- A. Smoke detectors in schools
- B. Medical X-rays
- C. Rocks and cosmic rays
- D. Nuclear power stations