Quantum Physics | Photons, the Photoelectric Effect & Matter Waves | Physics Unit | Honors & AP

Quantum Physics is a complete, no-prep physics unit for Grades 11–12 · Honors, AP & A Level: four double lessons (8 × 45 minutes) with teacher lesson plans, two reading passages, four print-ready worksheets, fully written answer keys, an assessment rubric and a 10-slide editable presentation — differentiated at three levels.

Guiding question: Why are classical particle and wave pictures alone insufficient for explaining microscopic phenomena?

The unit uses the photoelectric effect, photon energy, matter waves, interference and uncertainty to show how quantum models are built from experimental evidence. Students practise model comparison rather than treating wave–particle language as a slogan.

What's Included

• Teaching rationale and competency framework
• Complete lesson plans with timings for 4 double lessons (8 × 45 min)
• 2 detailed student reading passages
• 4 print-ready student worksheets
• Fully written solutions and an assessment rubric
• 20-point assessment with answer key
• 3 levels of differentiation: Foundation · Core · Extension
• Formula sheet and board summary
• 10 editable presentation slides (PPTX)
• Print and digital · US Letter and A4

The Four Double Lessons

1. Light exchanges energy in quanta
2. The photoelectric effect tests models
3. Matter displays wave behaviour
4. Quantum models predict distributions

Topics Covered

• Energy quantisation and the photon
• Planck's constant and photon energy
• The photoelectric effect and stopping voltage
• LED experiment for determining h
• De Broglie matter waves and electron diffraction
• Single-particle interference and probability
• The uncertainty principle and model limits

Students Will Learn To

• use central quantities, concepts and laws accurately in scientific language
• formulate a testable question, control variables, analyse measurements and identify uncertainty
• present graphs, equations, models and experimental reports appropriately for the audience
• test physical claims, identify model limits and weigh technological or societal applications

Prerequisites & Equipment

Prior knowledge: waves and interference; energy conservation; electric potential and scientific notation

Equipment for the investigation: LEDs of different colours, power supply, voltmeter

Perfect For

• AP Physics 1 & 2 and AP Physics C support
• IB Physics SL/HL and A Level Physics
• Honors and enrichment courses
• Homeschool and independent study
• Sub plans and review weeks
• Lab-based inquiry units
• NGSS-aligned science classrooms

Why Teachers Choose This Unit

• Genuinely no-prep: open, print, teach
• Answer keys for every task, not just the hard ones
• Three differentiation levels built into the same lesson
• Hands-on investigation with realistic sample data included
• Editable slides you can adapt to your own sequence
• Model limits made explicit — students learn where physics stops, too

Created with AI assistance: ChatGPT (OpenAI) and Claude (Anthropic). All materials were reviewed and edited by a qualified teacher before publication.

Frequently Asked Questions

What grade levels is this unit for?

It is written for Grades 11–12 · Honors, AP & A Level. The Foundation / Core / Extension tasks let you use the same lesson across a mixed-ability class.

How long does the unit take?

Four double lessons, 8 × 45 minutes in total. Each double lesson can be split into two single periods.

Do I need laboratory equipment?

The core investigation uses: LEDs of different colours, power supply, voltmeter. Sample data and fully worked results are included, so the unit also works without equipment.

What file formats do I get?

Editable Word documents for the teaching unit and worksheets and an editable PowerPoint presentation, delivered as an instant digital download.