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# The electromagnetic spectrum

The electromagnetic spectrum is a continuous range of related waves. The waves in this spectrum are called electromagnetic waves or electromagnetic radiation.

Different types of electromagnetic waves are characterised by their frequencies and wavelengths. Waves which have a higher frequency have more energy.

All of the waves in the spectrum share the following properties:

• They are transverse waves.
• They can travel through a vacuum
• They travel at the same speed in a vacuum $(3 \times 10^{8} \text{ m/s})$.
• They transmit energy.