Radiofrequency
Radiofrequency
Radiofrequency (pronunciation: /ˌreɪdioʊˈfriːkwənsi/) is a term that refers to the oscillation rate of electromagnetic radio waves in the range of 3 kHz to 300 GHz, as well as the alternating currents carrying the radio signals. This is the frequency band that is used for radio communication.
Etymology
The term "radiofrequency" is derived from the words "radio" and "frequency". "Radio" comes from the Latin word "radius", meaning "beam of light" or "spoke of a wheel". "Frequency" comes from the Latin word "frequentia", meaning "crowd" or "multitude". This term was first used in the early 20th century, with the development of wireless communication technology.
Related Terms
- Electromagnetic spectrum: The range of all possible frequencies of electromagnetic radiation.
- Radio wave: A type of electromagnetic wave, as defined by the frequencies on the electromagnetic spectrum that are lower than 300 GHz.
- Alternating current (AC): An electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction.
- Wireless communication: The transfer of information between two or more points that are not connected by an electrical conductor.
See Also
External links
- Medical encyclopedia article on Radiofrequency
- Wikipedia's article - Radiofrequency
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