LuduminaWA-08 · WA-U3 · Planned
Electromagnetic spectrum
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.
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.