Content 5.1 Most Common LAN Media 5.1.5 Wireless communication Wireless signals are electromagnetic waves, which can travel through the vacuum of outer space and through media such as air. Therefore, no physical medium is necessary for wireless signals, making them a very versatile way to build a network.
Figure represents an electromagnetic wave.
Figure illustrates one of the most important charts in all of science and technology, the Electromagnetic Spectrum chart. This speed might more accurately be called the speed of electromagnetic waves. All of these waves will travel through vacuum, however, they have very different interactions with various materials. The primary difference between the different electromagnetic waves is their frequency. The interactive calculator in Figure allows you to experiment.