Quantum Wave Workshop

Overview

Students explore wave–particle duality using PhET’s Quantum Wave Interference simulation and a short set of thought experiments, focusing on wave properties and observable wave behaviours as they transition from “classical-like” patterns to quantum probabilistic patterns.

Learning intentions

Students will:

• Explain how wave interference produces measurable patterns in both light and matter contexts.
• Describe key behaviours of waves (superposition, interference, diffraction/spreading) observed in simulations.
• Interpret quantum outcomes (probability/accumulation patterns) as evidence for particle-like detections occurring in a wave-interference framework.
• Communicate a scientific argument using evidence from the simulation for a specified audience.

Success criteria

I can:

• Identify what changes in the simulation and link each change to a change in the interference pattern.
• Use scientific language (e.g., wave interference, superposition, path/trajectory, probability, detection) accurately.
• Distinguish “pattern build-up” from single-event behaviour and explain why single detections appear random.
• Write a short argument that uses simulation evidence to support a claim about wave–particle duality.

Curriculum links

• PY-11-02: Students explain the properties and behaviours of waves, including interference and how wave effects appear in observations.
• PY-11WS-07: Students communicate scientific arguments using evidence and scientific terminology for a specific audience.
• PY-11WS-06 and PY-11WS-04: Students use scientific process to solve problems and select/process quantitative/qualitative data from the simulation.
• PY-11WS-01: Students develop and evaluate a question or hypothesis (e.g., “How does changing quantum parameters affect the interference pattern?”).

Lesson structure (45 minutes)

1. 0–5 min · Hook (dual nature). Teacher displays two quick screenshots: one showing a clear interference pattern and one showing scattered detections, and asks: “What evidence suggests waves versus particles here?” Students free-write 1–2 sentences, then share with a partner.

2. 5–12 min · Starter thought experiment + question. Teacher prompts a short scenario: “Imagine firing individual particles at a barrier with two paths—do you expect a pattern after one particle or after many?” Students predict and justify whether a pattern should emerge, then convert this into a class question: “How do simulation settings change the observed interference pattern over time?”

3. 12–25 min · PhET exploration (guided). Teacher sets up expectations: students record what they change and what they observe (no “guessing only”). In pairs, students run the simulation and test two parameter changes (teacher chooses in advance which ones to focus on, e.g., changing the quantum parameter / interference strength / particle emission conditions available in the sim). Students:

• Collect qualitative data: describe the pattern type (fringes vs build-up scatter).
• Record one quantitative-ish observation where possible (e.g., relative clarity: “high/medium/low”, time to visible pattern, or approximate counts if the sim provides it).
• Answer: “What remains wave-like?” “What becomes more random?”

4. 25–35 min · Class synthesis (wave behaviours to quantum interpretation). Teacher leads a discussion using prompts on the board:

• “Where is interference in your observations?”
• “Why do single detections look random but many detections form structure?”
• “How does the simulation show properties of waves while still producing particle-like detection events?” Students complete a quick “Claim–Evidence” organizer: a claim about duality, one evidence statement from their runs, and one link to wave behaviour described in PY-11-02.

5. 35–43 min · Communication task (audience-specific argument). Teacher assigns a mini-task: Write a 7–9 sentence response to one audience:

• Option A (peer science club): explain the results plainly using correct terminology.
• Option B (physics student): include more precise reasoning about interference and probability build-up. Students write individually, using at least two wave-related terms (e.g., interference, superposition) and one duality term (e.g., probability/randomness, detection events).

6. 43–45 min · Exit ticket. Students answer: “In one sentence, explain how changing quantum settings affected interference, and in one sentence explain why individual events do not look like interference.”

Resources

• Devices with access to PhET simulation: Quantum Wave Interference
• Headphones optional (if audio cues exist in simulation)
• Student device worksheet with tables for parameter change → observation
• Claim–Evidence organizer (printed or shared digital)
• Writing paper or digital doc for the argument paragraph
• Timer visible to students

Assessment

• Formative: teacher circulates during simulation to check students are recording parameter changes and observations accurately.
• Formative: check the “Claim–Evidence” organizer for correct links between interference patterns and wave behaviours.
• Exit ticket (2 short responses) to assess understanding of interference vs randomness and communication of evidence.

Differentiation

• Support: provide sentence starters for the communication task (e.g., “The interference pattern changes because…”, “Single detections appear random; however…”).
• Support: offer a reduced checklist of which simulation settings to vary and what to look for (pattern clarity, fringe spacing, build-up over time).
• Extension: students who finish early add an extra comparison run and explain whether the outcome is more “wave-like” or more “particle-like” and why.
• EAL/SEN: allow short verbal justification with partner before writing; provide a word bank of key terms (interference, superposition, wave, probability, detection).