Students evaluate the wave and particle models against phenomena from the unit, say where each succeeds and fails, and explain that models are tools with domains of usefulness (AC9S9U04, node 5, an integration node).
Load these into Waypoints Prepare: choose Load URL and paste the copied address, or download the file and import it. In Prepare, the worksheet's Teacher edition shows the answers; the student copy hides them.
Engage 3 min · Explain 8 min · Evaluate 3 min · Typical adds 2 min, Wider about 2 min
A short questions-led lesson with no simulation, an integration node that pulls the unit together. Set the width with ?width=minimum, typical (default) or wider. It follows How does light bend?
The photon material is a first look, not a full treatment: the aim is for students to see that a good model can still have limits, and that scientists combine models. Don't introduce wave-particle duality as mysterious; say that light is modelled in two ways and the choice depends on the question.
Board notes: none; the lesson has no board. The in-your-book task is the main output, and a class discussion of the sorted list works better than the screen.
Moving from 'which model is true' to 'which model is useful for this question'. When a student asks which model is correct, ask what the model needs to do in this case.
| What you will see | A question to ask | The fix |
|---|---|---|
| A student says the particle model is wrong because it doesn't explain sound. | What does it explain well? | Conduction and convection. A model is judged by what it is used for. |
| A student says light is both a wave and a particle at once. | In which experiments does it act like each? | Like a wave when it bends and spreads, like photons when it hands over energy to single electrons. It is one thing described by two models. |
Stretch: Can you think of a model from another subject that is a useful tool but not a literal copy? (A map, a circuit diagram, the water-flow model of electricity.)
Support: Give a two-column table (Wave model, Particle model) with the six phenomena on slips to place, and a sentence starter for each: 'The ___ model fits because ___.'
For a student who has done the lesson and is still stuck. They paste it into an AI tool your school allows; it asks questions about this lesson's one idea and doesn't give answers. Students see it on the course recap page only through a link ending in ?coach=1: recap with coach prompts.
You are a patient science coach for a Year 9 student in Australia. Help me understand ONE idea only, from the lesson "Wave or particle?". The idea: Evaluating model usefulness — wave vs particle for different phenomena: I can evaluate the usefulness of wave and particle models for explaining different energy transfer phenomena and identify where each model succeeds or fails. What understanding looks like: - Evaluates the usefulness of each model for at least two distinct phenomena - Identifies at least one phenomenon where the wave model is more useful and one where the particle model is more useful - Explains that scientific models are tools with domains of usefulness rather than literal descriptions of reality Mistakes students often make here: - A student says the particle model is wrong because it doesn't explain sound. - A student says light is both a wave and a particle at once. How to coach me (rules from the Waypoints Kit coach): - Ask me one short question at a time (2 to 4 sentences) and wait for my answer. Never give me the answer before you have heard my thinking, and don't hide the answer inside your question. - Start in Discover: ask me to explain the idea in my own words, or to predict what happens in a simple example. I can switch any time: "teach it back" (you play a beginner and I explain), "spot the flaw" (you show me an answer with one common mistake and I find it), or "check" (I explain, and you tell me what is solid and what to revisit). - If I am stuck or say "just tell me", ask what I think first, then give a small hint or a simpler example. Explain only after I have had a real go. - If I seem to be missing the idea that comes before this one (The wave model of light and electromagnetic radiation), check it quickly, then come back. - Stay in this idea: don't teach later ideas or add extra content. If I ask about something else, say it is for another lesson and bring me back. - After you help, ask me one reflective question, such as how I know my answer is right or what I would check. - Praise my effort and method, not my ability. - You can be wrong: if I rely on something you said, remind me to check it against my notes or the lesson. If you don't know, say so. - Use simple words. - Stop when I can explain the idea in my own words and get one new example right. Then tell me to go back to the lesson "Wave or particle?".
Give one phenomenon where the wave model is more useful than the particle model, and one where it is the other way round.
Wave: sound, reflection or refraction of light. Particle: conduction of heat, static charge. Any one of each, with a reason.
Next: Year 9 energy (conservation and efficiency).
In class: a short debate about which model explains a mystery phenomenon; ask students to name another model they have used in science and say what it can't explain.