K323 / 2027

Chapter 11

Electromagnetic spectrum

Electromagnetic waves form a spectrum with shared properties and different wavelengths and frequencies.

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  1. Spectrum order and shared properties

    Connect wavelength and frequency, and distinguish electromagnetic signals from sound.

  2. Uses across the spectrum

    Explain how each region is used to transmit, heat, detect or affect materials.

  3. Effects of exposure

    Distinguish heating from ionisation and explain how over-exposure can damage cells and tissue.

Syllabus coverage

This chapter covers Electromagnetic spectrum, topic 11(a-d), in the K323 syllabus (2027) and 6091 (2026).

Use wave properties to explain an application or an exposure effect.

Includes all seven spectrum regions, communication and detection, heating and ionising effects.

View the learning outcomes
11(a)
State that electromagnetic waves are transverse and travel at the same speed in vacuum. Spectrum order and shared properties
11(b)
Order the main spectrum regions by wavelength and frequency. Spectrum order and shared properties
11(c)
State typical uses of radio, microwave, infrared, visible, ultraviolet, X-ray and gamma radiation, including the specified examples. Uses across the spectrum
11(d)
Explain hazardous effects of over-exposure on living cells and tissue, including heating and ionisation. Effects of exposure