Edexcel•GCSE•Physics
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Light and the Electromagnetic Spectrum
Visible light, EM spectrum properties, uses and dangers
Practice 32 subtopics in Light and the Electromagnetic Spectrum. All questions match the Edexcel GCSE specification.
About Light and the Electromagnetic Spectrum
Light and the Electromagnetic Spectrum is a key topic in the Edexcel GCSE Physicsspecification. This topic covers visible light, em spectrum properties, uses and dangers.
Master all 32 subtopics below with unlimited AI-generated questions. Each subtopic page includes sample questions and the ability to generate unlimited practice questions with detailed solutions.
All Subtopics (32)
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Visible light as part of EM spectrumColours of visible light (ROYGBIV)Wavelength and frequency of visible light coloursWhite light and prisms (dispersion)Primary colours of light (red, green, blue)Secondary colours (cyan, magenta, yellow)Colour filters and absorptionColoured objects and reflected lightEM waves as transverse wavesSpeed of EM waves in vacuum (3 × 10⁸ m/s)EM spectrum order (radio, microwave, infrared, visible, UV, X-ray, gamma)Wavelength and frequency relationshipsHigher frequency = shorter wavelengthHigher frequency = more energyCore Practical: Investigate refraction in glass blocksRefraction of light at boundariesRefractive index (n = c/v) (H)Snell's law (n₁sinθ₁ = n₂sinθ₂) (H)Total internal reflectionCritical angleOptical fibres and communicationRadio waves (broadcasting, communication)Microwaves (cooking, mobile phones, satellite communication)Infrared (heating, thermal imaging, remote controls, optical fibres)Visible light (vision, photography, optical fibres)Ultraviolet (fluorescent lamps, security marking, detecting counterfeit notes)X-rays (medical imaging, airport security)Gamma rays (sterilisation, cancer treatment, medical tracers)Ionising radiation (UV, X-rays, gamma)Dangers of ionising radiation (cell damage, cancer, mutations)Safety precautions for ionising radiationNon-ionising radiation hazards (burns, cataracts)
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