# The electromagnetic spectrum

The electromagnetic spectrum consists of a group of radiations that all travel at the speed of light ($$3\times 10^{8},m\,s^{-1}$$).

In the middle of the EM spectrum is the visible spectrum consisting of a range of different colours of light:

• Red
• Orange
• Yellow
• Green
• Blue
• Indigo
• Violet

There are many other parts of the EM spectrum that we cannot see.

The diagram below illustrates these parts.

Chart showing types of electromagnetic waves