Radio Waves - GCSE Physics Definition

Radio waves are a type of electromagnetic wave that have the longest wavelengths in the electromagnetic spectrum, and the lowest frequencies. They are used to carry signals for radios, televisions, and mobile phones, helping to transmit music, conversations, and data over long distances. Radio waves travel at the speed of light and can pass through the air, walls, and the human body. They are generated by electric charges (often in radios or other transmitters) that move back and forth rapidly. These waves operate at frequencies ranging from about 30 hertz (Hz) to 300 gigahertz (GHz), with the lower frequencies being used for AM radio and higher frequencies for FM radio and television broadcasts.