3: Electromagnetic Waves Last updated Jun 23, 2019 Save as PDF 2.5: Further Topics 3.1: The Electromagnetic Spectrum Page ID17109 ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy3.1: The Electromagnetic SpectrumRadio waves are EM (Electromagnetic)waves that have wavelengths between 1 millimeter and 100 kilometers (or 300 GHz and 3 kHz in frequency).3.2: Electromagnetic Waves and their PropertiesMaxwell’s equations help form the foundation of classical electrodynamics, optics, and electric circuits.3.3: Applications of EM WavesWireless communication is the transfer of information between two or more points that are not connected by an electrical conductor.