extremely low frequency
(ELF)
(electromagnetic radiation, frequency 3 Hz to 30 Hz)
Extremely low frequency (ELF) radiation is defined by
the ITU to be electromagnetic radiation within the frequency range of 3 to 30 Hz.
It is considered within the lower-frequency end of the
radio spectrum, or beyond (subradio).
It is adjacent to super low frequency (SLF), and the term tremendously low frequency (TLF)
is sometimes used for even lower frequency.
(EMR,spectrum,band,radio,subradio)
Further reading:
https://en.wikipedia.org/wiki/Extremely_low_frequency
https://en.wikipedia.org/wiki/Radio_spectrum#ITU
https://www.itu.int/dms_pubrec/itu-r/rec/v/R-REC-V.431-7-200005-S!!PDF-E.pdf
| WaveL | Freq | Photon
Energy | | |
| 9993km | 30Hz | 124×10-15eV | begin | extremely low frequency |
| 99930km | 3Hz | 12×10-15eV | end | extremely low frequency |
|
Referenced by pages:
subradio
super low frequency (SLF)
tremendously low frequency (TLF)
Index