| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Physics |
| Lesson Topic: state that (electron) antineutrinos are produced during β– decay and (electron) neutrinos are produced during β+ decay |
Learning Objective/s:
- Describe the particles emitted in β⁻ and β⁺ decay.
- Explain how lepton‑number conservation determines the type of (anti)neutrino produced.
- Compare the energy release and nuclear changes between β⁻ and β⁺ decay.
- Apply the decay equations to identify products for a given nucleus.
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Materials Needed:
- Projector or interactive whiteboard
- PowerPoint slides with decay diagrams
- Printed worksheet with decay equations and comparison table
- Set of isotope cards for quick‑fire activity
- Clicker or polling software for concept checks
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Introduction:
Begin with a striking question: “What invisible particle carries away the missing energy in beta decay?” Recall that students have previously studied beta particles and nuclear transmutation. Today they will be able to state which (anti)neutrino accompanies each decay mode.
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Lesson Structure:
- Do‑now (5'): Students answer the opening question on sticky notes; collect responses.
- Mini‑lecture (10'): Present β⁻ and β⁺ decay equations, highlighting antineutrino vs neutrino.
- Guided practice (12'): Work through isotope examples on the worksheet, filling in missing particles.
- Comparison activity (8'): Teams match decay features from the table using cards and discuss lepton‑number balance.
- Check for understanding (5'): Quick poll via clickers; address any misconceptions.
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Conclusion:
Summarise that β⁻ decay emits an electron antineutrino while β⁺ decay emits an electron neutrino, both ensuring lepton‑number balance. Ask students to write a one‑sentence exit ticket stating the key difference. For homework, assign reading of the textbook section on weak interactions and a set of practice problems.
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