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Qu'est-ce (qui) est Extremely Low Frequency - définition
Extremely low frequency
![Typical spectrum of ELF electromagnetic waves in the Earth's atmosphere, showing peaks caused by the [[Schumann resonances]]. The Schumann resonances are the resonant frequencies of the spherical Earth-ionosphere cavity. Lightning strikes cause the cavity to "ring" like a bell, causing peaks in the noise spectrum. The sharp power peak at 50 Hz is caused by radiation from global [[electric power grid]]s. The rise of the noise at low frequencies ''(left side)'' is radio noise caused by slow processes in the Earth's [[magnetosphere]].](https://commons.wikimedia.org/wiki/Special:FilePath/Schumann resonance spectrum.gif?width=200 "Typical spectrum of ELF electromagnetic waves in the Earth's atmosphere, showing peaks caused by the [[Schumann resonances]]. The Schumann resonances are the resonant frequencies of the spherical Earth-ionosphere cavity. Lightning strikes cause the cavity to \"ring\" like a bell, causing peaks in the noise spectrum. The sharp power peak at 50 Hz is caused by radiation from global [[electric power grid]]s. The rise of the noise at low frequencies ''(left side)'' is radio noise caused by slow processes in the Earth's [[magnetosphere]].")
THE 3-30 HZ RANGE OF THE ELECTROMAGNETIC SPECTRUM
Extremely Low Frequency; Extremely Low Frequencies; Super extremely low frequency; Super Extremely Low Frequency; Below Extremely Low Frequency Band; ELF wave
Extremely low frequency (ELF) is the ITU designation for electromagnetic radiation (radio waves) with frequencies from 3 to 30 Hz, and corresponding wavelengths of 100,000 to 10,000 kilometers, respectively. In atmospheric science, an alternative definition is usually given, from 3 Hz to 3 kHz.
Low-frequency oscillation
TECHNIQUE IN ELECTRONIC MUSIC
Low-frequency oscillator; Low Frequency Oscillation; Low frequency oscillator; Low Frequency Oscillator; Low frequency oscillation
Low-frequency oscillation (LFO) is an electronic frequency that is usually below 20 Hz and creates a rhythmic pulse or sweep. This is used to modulate musical equipment such as synthesizers to create audio effects such as vibrato, tremolo and phasing.
low frequency
![An LF [[radio clock]].](https://commons.wikimedia.org/wiki/Special:FilePath/Atomic clock.jpg?width=200 "An LF [[radio clock]].")
THE 30-300 KHZ RANGE OF THE ELECTROMAGNETIC SPECTRUM
Low frequencies; Low band; Low Frequency
¦ noun (in radio) 30-300 kilohertz.
Exemples du corpus de texte pour Extremely Low Frequency
1. Conflicting studies × Swedish study finds threefold increased risk of childhood leukaemia in families living within 50 metres of power lines. × Canadian study finds 80 per cent increased risk for children within 100 metres of lines. × Analysis of nine studies finds doubling of childhood leukaemia in families exposed to magnetic fields of 0.4 microteslas (within 60 metres). × International Agency for Cancer Research classifies extremely low frequency magnetic fields as "possibly carcinogenic". × UK Childhood Cancer Study concludes electromagnetic fields "are not principal causes, if at all, of leukaemia in children." × Oxford Children‘s cancer group concludes living within 600 metres of lines could account for five cases of leukaemia a year.