E.3 Radioactive decay Quiz
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5 questions, one answer each
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1. Which is emitted with a positron in β⁺ decay?
- A. An antineutrino
- B. A neutrino
- C. An electron
- D. An alpha particle
2. HL: A nuclide has a half-life of 10 s. Its decay constant is:
- A. 0.069 s⁻¹
- B. 0.10 s⁻¹
- C. 6.9 s⁻¹
- D. 14 s⁻¹
3. HL: A sample has 2.0 × 10¹⁰ nuclei and λ = 3.0 × 10⁻⁴ s⁻¹. Its activity is:
- A. 6.0 × 10⁶ Bq
- B. 6.7 × 10¹³ Bq
- C. 1.5 × 10⁻¹⁴ Bq
- D. 2.0 × 10¹⁰ Bq
4. HL: The continuous energy spectrum of beta particles is evidence for:
- A. Nuclear energy levels
- B. The neutrino or antineutrino
- C. The strong nuclear force
- D. Background radiation
5. HL: Heavy stable nuclei have N/Z greater than 1 because:
- A. Neutrons repel protons
- B. Extra neutrons add attraction without adding repulsion
- C. Protons are heavier than neutrons
- D. Neutrons carry negative charge