England · Waves · Unit WA-U3

Electromagnetic waves

A proposed unit with 4 lectures, independent practice and a unit assessment.

Unit scope

Filters show lectures with relevant core content. Mixed lectures retain clearly labelled Higher/separate extensions; those extensions are not required on other routes. Difficulty is a design rating, not a GCSE grade.

Lectures

WA-U3 · Electromagnetic waves

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WA-08 · WA-U3 · Planned

Electromagnetic spectrum

  • ScopeShared
  • Difficulty2 / 4 · proposed
  • Time30–35 min · estimated
  • StatusPlanned

Learning objectives

Order EM groups by wavelength/frequency; explain energy transfer and common vacuum speed.

8463 §§4.6.2.1 / 8464 §§6.6.2.1

DfE single-science pp.37–39 / Combined pp.32–33. Evidence checked 30 September–1 October 2026. Skills: WS1.2,4.4; MS1b,3c.

Needs firstWA-02,EN-02

Explanation

The electromagnetic spectrum is continuous; named bands group wavelengths and frequencies. All groups travel at the same speed in a vacuum, so higher frequency corresponds to shorter wavelength there. Visible colours label only the band eyes can detect.

Concepts, equations and units: Radio, microwave, IR, visible red→violet, UV, X-ray, gamma; transverse; v=fλ; vacuum c≈3×10⁸ m/s supplied for calculation.

Prediction, demonstration and game exercise

Predict, observe, explain

Sweep an annotated spectrum and show common vacuum travel time; label visible as a small range.

Planned learner game exercise

Sort spectrum bands and match source-to-absorber transfer cards; compare waves on the same distance.

Independent practice

Three frequency/wavelength calculations with standard form; identify inverse trend.

Original practice example · Shared

An EM wave has frequency 1.0 × 10⁸ Hz. Use c = 3.0 × 10⁸ m/s. Find wavelength.

Show working and model answer

Working / reasoning

λ = c/f = (3.0 × 10⁸)/(1.0 × 10⁸).

Answer

3.0 m.

Exit check and success criteria

All seven bands ordered and two calculations correct.

During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.

Misconceptions, practical links and mastery

Check these misconceptions

Gamma travels faster than radio in vacuum; EM waves require air; coloured spectrum labels are actual colours of invisible radiation.

Practical preparation

No RP; cross-link WA-11 infrared.

Virtual preparation and revision only. Required hands-on activities and school records remain separate.

Proposed mastery

0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.

Full lecture page →

WA-09 · WA-U3 · Planned

Applications, hazards and dose evidence

  • ScopeShared + Higher suitability explanations
  • Difficulty3 / 4 · proposed
  • Time35–40 min · estimated
  • StatusPlanned

Learning objectives

Match every specified EM group to applications; evaluate supplied exposure data; H: explain suitability.

8463 §§4.6.2.3–4.6.2.4 / 8464 §§6.6.2.3–6.6.2.4

DfE single-science pp.37–39 / Combined pp.32–33. Evidence checked 30 September–1 October 2026. Skills: WS1.4,1.5,3.5; MS1c,2c.

Needs firstWA-08; AT-03 for nuclear link

Explanation

Applications exploit how waves interact with matter. Exposure risk depends on radiation type and dose; ionising radiation can damage cells. A given dataset supports a specific comparison, not a universal safety conclusion or a clinical recommendation.

Concepts, equations and units: Radio broadcast; microwave communications/cooking; IR heaters/cameras; visible fibre optics; UV lamps/tanning; X/gamma imaging/treatment; Sv/mSv supplied units, not recall requirement.

Prediction, demonstration and game exercise

Predict, observe, explain

Compare penetration/absorption in schematic materials and model exposure data; identify gamma nuclear origin.

Planned learner game exercise

Design a communications/imaging toolkit and reject unsafe exposure choices using provided evidence.

Independent practice

Three risk-data questions and two application explanations; H links physical property to use.

Original practice example · Shared

A supplied exposure table lists 0.002 Sv. Convert it to mSv.

Show working and model answer

Working / reasoning

1 Sv = 1000 mSv; 0.002 × 1000.

Answer

2 mSv. The dose unit is supplied for interpretation, not a recall requirement here.

Exit check and success criteria

At least one accurate use per band, consistent dose conversion and evidence-based risk comparison.

During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.

Misconceptions, practical links and mastery

Check these misconceptions

All radiation is radioactive; non-ionising means harmless at every dose; dose and activity are the same quantity.

Practical preparation

Source-based risk analysis; no learner exposure experiments.

Virtual preparation and revision only. Required hands-on activities and school records remain separate.

Proposed mastery

0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.

Full lecture page →

WA-10 · WA-U3 · Planned

Radio production, absorption and selective interactions

  • ScopeShared Higher
  • Difficulty3 / 4 · proposed
  • Time30–35 min · estimated
  • StatusPlanned

Learning objectives

Explain oscillating circuits producing radio waves and induced oscillations on reception; compare wavelength-dependent material interactions.

8463 §§4.6.2.2–4.6.2.3 / 8464 §§6.6.2.2–6.6.2.3

DfE single-science pp.37–39 / Combined pp.32–33. Evidence checked 30 September–1 October 2026. Skills: WS1.2,1.4,3.5; MS4a.

Needs firstWA-08,EL-07

Explanation

Oscillating electrical circuits can emit radio waves. When a receiving circuit absorbs a radio wave, it can develop electrical oscillations at the wave’s frequency. Material interactions depend on wavelength, so a route transparent to one band may absorb another.

Concepts, equations and units: AC frequency Hz; transmitter/receiver frequencies correspond; materials selectively absorb/transmit/reflect/refract; no antenna engineering formulas.

Prediction, demonstration and game exercise

Predict, observe, explain

Animate an oscillating circuit and receiving current at the same frequency; show model material response.

Planned learner game exercise

Tune transmitter/receiver frequency and choose a material route based on supplied response graphs.

Independent practice

Explain a reception failure and interpret two transmission/absorption curves.

Original practice example · Shared Higher

A radio wave of 2 MHz is received in the model circuit. What is the induced oscillation frequency?

Show working and model answer

Working / reasoning

The absorbing circuit’s oscillations correspond to the radio-wave frequency in this model.

Answer

2 MHz.

Exit check and success criteria

Frequency correspondence correct and explanation uses wavelength-dependent interaction evidence.

During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.

Misconceptions, practical links and mastery

Check these misconceptions

Radio waves transport current through empty space; all materials behave identically for every wavelength.

Practical preparation

Optional teacher demonstration/supplied circuit signals; not an RP.

Virtual preparation and revision only. Required hands-on activities and school records remain separate.

Proposed mastery

0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.

Full lecture page →

WA-11 · WA-U3 · Planned

Infrared surfaces investigation

  • ScopeShared
  • Difficulty3 / 4 · proposed
  • Time35–40 min · estimated
  • StatusPlanned

Learning objectives

Plan comparisons of absorption/emission for different surfaces; control geometry and temperature.

8463 §§4.6.2.2;8.2.10 / 8464 §§6.6.2.2;10.2.21

DfE single-science pp.37–39 / Combined pp.32–33. Evidence checked 30 September–1 October 2026. Skills: WS2.1–2.7,3.4,3.7; MS2b,2c,4c.

Needs firstEN-09,WA-08

Explanation

A surface comparison needs equal geometry, distance and relevant starting temperatures. Good infrared absorbers are also good emitters. Compare like measurements and state whether the detector measures radiation directly or whether temperature change provides indirect evidence.

Concepts, equations and units: Infrared transfer; temperature °C, time s, detector signal in labelled units; dark matt versus light shiny surfaces; no Stefan–Boltzmann equation.

Prediction, demonstration and game exercise

Predict, observe, explain

Compare model detector readings from equally hot surfaces and warming rates under equal irradiation.

Planned learner game exercise

Select detector distance, initial temperature, surface finish and repeats; collect both absorption/emission evidence.

Independent practice

Plot results with uncertainty; distinguish temperature readings from direct radiation measurements.

Original practice example · Shared

Equally hot surfaces at the same distance give repeated detector signals: matt A = 18, 19, 20; shiny B = 6, 7, 8 arbitrary units. Compare means.

Show working and model answer

Working / reasoning

Mean A = 57/3 = 19; mean B = 21/3 = 7. A’s emitted detector signal is larger under the stated controls.

Answer

19 and 7 units; A emits a larger measured IR signal in this setup.

Exit check and success criteria

Controlled comparison with labelled data and a conclusion limited to the tested surfaces.

During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.

Misconceptions, practical links and mastery

Check these misconceptions

Black surfaces only absorb and never emit; visible colour alone determines every radiation property.

Practical preparation

RP-P10/RP-C21; AT1,4.

Virtual preparation and revision only. Required hands-on activities and school records remain separate.

Proposed mastery

0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.

Full lecture page →

Area capstone

Sources and full programme

Sources checked 30 September–1 October 2026. Specifications govern content; textbooks supplement it. England has no single prescribed Physics course book. The full planning document includes sourced comparisons of Collins separate Physics and Trilogy books, Hodder/Hachette Physics and Oxford Physics listings, with access/approval limitations.

Download the complete Markdown programme and coverage matrix

A subsection map is proposed coverage. Clause-level educator review, item moderation, model validation and hands-on provision remain release gates. No all-board alignment or exam-board endorsement is claimed.