Nuclear Physics · SHS2 Physics

Lesson notes

Learning Objectives

Indicator: 2.4.2.LI.1 - State the radioactive decay law

By the end of the lesson, learners can:

State the radioactive decay law in their own words, both as a statement and as the mathematical expression N = N₀e^(−λt).
Identify and define the terms N (number of undecayed nuclei), N₀ (initial number of nuclei), λ (decay constant), and t (time) in the decay equation.
Explain the meaning of the decay constant (λ) and relate it to the probability of decay of a single nucleus per unit time.
Apply the radioactive decay law to solve simple computational problems involving the decay of a given sample.
Justify why radioactive decay is described as a random and spontaneous process, using evidence from observations.

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Curriculum details

Strand: Atomic and Nuclear Physics (Strand 4)
Sub-strand: Nuclear Physics (4.2)
Content standard: 2.4.2.CS.1 - Demonstrate knowledge and understanding of the atom as an agent for energy production 2.4.2.LO.1 Recognise the amount of energy an atom can produce when there is a change in its mass.
Indicator: 2.4.2.LI.1 - State the radioactive decay law
Suggested placement: Semester 2, Week 19 (Week 39 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 143

Exemplars (from the NaCCA curriculum)

Experiential Learning: Guide learners to discuss and state the radioactive decay law.
Engage learners in discussions and activities that examine prevalent myths or misconceptions surrounding gender and disabilities in the context of physics, encouraging critical thinking and dispelling these misconceptions through evidence-based exploration.
Assessment (2.4.2.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.
Teaching and Learning Resources:
- Videos
- PhET interactive simulations
- Projectors
- Audio-visuals