The Electromagnetic Spectrum
Describe the full electromagnetic spectrum from radio waves to gamma rays, in order of increasing frequency and energy; explain that all EM waves travel at the same speed in a vacuum; and describe the uses and hazards of different regions
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1858 concepts · 9 subjects
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The Electromagnetic Spectrum means practising the idea at the table with a simple hands-on check. We will demo once, then your child tries.
Materials: A small toy car or ball; A ramp or book stack and a ruler. 1. Say the goal of The Electromagnetic Spectrum in plain words once. 2. Adult gives one gentle push and one stronger push, then compares how far the object travels. 3. Child tries three push or pull trials and records which force made a bigger change. 4. Fresh check: one fresh push/pull comparison. Record and stop. Done: three recorded trials with a clear force comparison. Proof: parent note of examples and results. Stop: End after the fresh check; keep optional challenge for another day.
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Start practiceThe Electromagnetic Spectrum practice
Practice key ideas from The Electromagnetic Spectrum.
Free · no login · no ads · Practice answers and completion are not saved. Parent observation remains the lesson record.
Learning resources
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PhET Interactive Simulations · Practice link — not the full lesson
Wave on a String
Before you open · source notes
Wave on a String supports hands-on exploration for The Electromagnetic Spectrum. Not every lab worksheet.
Free interactive page, no sign-in required for the tested path.
Before you openAsk the learner what they changed in the sim or page and what they observed.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public PhET Interactive Simulations page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.
PhET Interactive Simulations. “Wave on a String.” External page; Gakuva does not copy, host, embed, or redistribute materials.
Unknown — link only
Check understanding
- Lists the seven regions of the EM spectrum in order of increasing frequency
- States that all EM waves travel at 3 × 10⁸ m/s in a vacuum
- Gives at least one use and one hazard for each region of the spectrum
- Explains why some EM waves are more dangerous to living tissue than others (linked to frequency/energy)
“If your child heard about microwaves, X-rays, and visible light all being part of the same family, could they explain what makes them different from each other and name one useful application and one risk for each?”
Curriculum record
- Type
- Conceptual
- Subject
- Science
- Domain
- Waves, Light & Sound
- Age range
- Ages 12–13
Standards