Physics · GCSE · Interactive lesson
The electromagnetic spectrum: order, properties and uses
Put the seven electromagnetic wave regions in order, compare wavelength and frequency, and connect each type with a specific everyday use.
Choose your view
Explore an interactive example, then try the questions at your own pace.
GCSE · practice across the spectrum
By the end of this lesson: Put electromagnetic waves in order and compare their properties.
The interactive diagram and controls are in Stage 2, “Explore one example”. Read the idea here, then try it next.
- Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays form one continuous spectrum.
- All are electromagnetic waves and can travel through a vacuum.
- Our eyes detect visible light, only one small part of this family.
Useful starting points
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What do the words mean?
- Spectrum
- A continuous range, grouped here into seven named regions.
- Frequency
- The number of complete wave cycles each second.
- Wavelength
- The distance between matching points on neighbouring waves.
- Vacuum
- A space with no matter. Electromagnetic waves can cross it; sound cannot.
- Ionising
- Able to remove electrons from atoms. X-rays and gamma rays are ionising.
Change the example
This is the lesson example. Your practice question uses its own numbers.
Something to try
Move one region towards gamma rays. Does wavelength get longer or shorter? Does the speed in a vacuum change?
Notice what changes
How particle motion works +
Starts paused. Press Play, then add energy to see the warmer particles move faster.
Particles keep the same size. Liquid particles move around; solid particles vibrate around fixed positions. This is a simplified model, with the change in motion exaggerated to make it easier to see.
About the playback +
About this model
The spectrum is continuous; the seven boxes are named regions, not seven individual frequencies or seven equal-width bands. Spacing and colours are labels, not a wavelength scale. Only visible light is visible to human eyes. X-rays and gamma rays are ionising; ultraviolet can also harm tissue, so “not X-rays” does not mean harmless.
More about this diagram
Still picture. Play particle motion in Stage 2.
Visible light: part 4 of 7 in this order
Still picture of the example from Stage 2. Use the back arrow to change it.
Work through it
Starting example: read the steps below
- Read from radio at the top towards gamma rays at the bottom.
- Frequency increases in that direction; wavelength decreases.
- The selected region is visible light.
- All seven types have the same speed in a vacuum. They are different from sound waves.
Try on your own
Your turn. No rush.
Question 1
Compare microwaves with ultraviolet in a vacuum. Which has the longer wavelength?
About these questions
Questions appear in a mixed order. Work at your own pace and stop whenever you like.
These questions use their own numbers, separate from the lesson example. You can stop whenever you like. Answers last for this visit to the page.
A good place to pause
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Can you put the seven regions in order and explain how wavelength and frequency change?
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Notes for parents and tutors
These lessons cover selected KS3 and GCSE ideas for England; they are not a complete course. The level notes explain where GCSE methods or optional extensions begin. Maurice can help you choose material for your course and exam board.
The content draws on the DfE Maths curriculum, DfE Science curriculum and AQA GCSE Physics specification. Level labels are guidance, not exam-board endorsements. For AQA Radioactivity, calculating net decline as a ratio is Higher-tier work. Net means the overall change; ask Maurice whether this extension is relevant to your course. Explanations and practice were reviewed during development on 21 October 2026; Maurice should check their fit before assigning work.
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