radiosäteilyä

Radiosäteilyä, also known as radio waves, is a type of electromagnetic radiation. It occupies the portion of the electromagnetic spectrum with wavelengths ranging from about one millimeter to 100 kilometers, and corresponding frequencies from 300 gigahertz down to 3 kilohertz. This means that radio waves have the longest wavelengths and lowest frequencies among all electromagnetic waves.

Radio waves are produced by oscillating electric charges. They can be generated naturally by phenomena such as lightning strikes or artificially by electronic devices like radio transmitters. These waves travel at the speed of light through a vacuum and can propagate through various media, including air and space.

The applications of radiosäteilyä are widespread. They are fundamental to modern communication technologies, including radio broadcasting, television broadcasting, mobile phone networks, Wi-Fi, radar systems, and satellite communication. Different frequency bands within the radio spectrum are allocated for specific purposes to avoid interference.

While generally considered non-ionizing, meaning they do not have enough energy to remove electrons from atoms or molecules, extremely high-intensity radio wave exposure can cause heating of biological tissues. However, typical exposure levels from consumer electronic devices are well within safety guidelines. The study and utilization of radio waves fall under the field of radio science and radio engineering.