Electromagnetic Spectrum
The G3 Physics and O-Level hub for electromagnetic-wave nature, spectrum order, applications, and exposure hazards.
Learning goals
- State that all electromagnetic waves are transverse
- State that all electromagnetic waves travel at the same speed in vacuum
- Order the seven electromagnetic-spectrum regions
- Relate spectrum order to wavelength and frequency
- State typical uses of radio waves
- State typical uses of microwaves
- State typical uses of infrared
- State typical uses of visible light
- State typical uses of ultraviolet
- State typical uses of X-rays
- State typical uses of gamma rays
- Describe hazardous heating effects of electromagnetic over-exposure
- Describe hazardous ionising effects on living cells and tissue
All electromagnetic waves are transverse and travel at the same speed in vacuum. Use these lessons in order to connect that common wave nature to spectrum position, applications, and exposure hazards.
Lessons
- Wave Nature and Spectrum Order — order the seven regions and track increasing frequency against decreasing wavelength.
- Applications of Electromagnetic Waves — justify a use with the relevant interaction, not a band name alone.
- Electromagnetic Exposure and Hazards — distinguish heating, photochemical, and ionising effects at syllabus depth.
Completion is lesson-specific
Opening this hub does not complete any of the three skills. Complete and check each lesson independently.
Check and apply
- Electromagnetic Spectrum check
- Waves quiz for mixed selected-response practice
- Waves structured practice for longer explanations
- EM Spectrum & Communication Explorer
- Waves hub for frequency, wavelength, and wave-speed prerequisites
Course and syllabus information
- Course
- SEC G3 Physics
- Edition
- SEC G3 Physics 2027