- extremely low frequencies
- сверхнизкие частоты
Большой англо-русский и русско-английский словарь. 2001.
extremely low frequencies
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Extremely low frequency — (ELF) is the band of radio frequencies from 3 to 30 Hz. ELF was used by the US Navy and Soviet/Russian Navy to communicate with submerged submarines.ExplanationBecause of the electrical conductivity of salt water, submarines are shielded from… … Wikipedia
Low-frequency effect — Low Frequency Effects (LFE) is the name of an audio track specifically intended for deep, low pitched sounds ranging from 3 200 Hz. This track is normally sent to a speaker that is specially designed for low pitched sounds called the subwoofer or … Wikipedia
Extremely high frequency — Frequency range 30 to 300 GHz ITU Radio Band Numbers 1 2 3 4 5 6 7 8 9 10 … Wikipedia
Super low frequency — (SLF) is the frequency range between 30 hertz and 300 hertz. This frequency range includes the frequencies of AC power grids (50 hertz and 60 hertz). The radio services Seafarer (USA) on 76 hertz and ZEVS (Russia) on 82 hertz operate in this… … Wikipedia
Espectro electromagnético — Saltar a navegación, búsqueda Diagrama del espectro electromagnético, mostrando el tipo, longitud de onda con ejemplos, frecuencia y temperatura de emisión de cuerpo negro. Se denomina espectro electromagnético a la distribución energética del… … Wikipedia Español
Electromagnetic radiation and health — Electromagnetic radiation can be classified into ionizing radiation and non ionizing radiation, based on whether it is capable of ionizing atoms and breaking chemical bonds. Ultraviolet and higher frequencies, such as X rays or gamma rays are… … Wikipedia
Schumann resonances — The Schumann resonances (SR) are a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earth s electromagnetic field spectrum. Schumann resonances are global electromagnetic resonances, excited by lightning discharges in the … Wikipedia
Ultrasound — Not to be confused with Supersonic .Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy,… … Wikipedia
Nikola Tesla — Tesla, aged 37, 1893, photo by Sar … Wikipedia
Mobile phone radiation and health — A man speaking on a mobile telephone The effect of mobile phone radiation on human health is the subject of recent interest and study, as a result of the enormous increase in mobile phone usage throughout the world (as of June 2009 … Wikipedia
OMEGA Navigation System — OMEGA was the first truly global radio navigation system for aircraft, operated by the United States in cooperation with six partner nations.HistoryOMEGA was originally developed by the United States Navy for military aviation users. It was… … Wikipedia
