extremely low frequency
(electromagnetic radiation, frequency 3Hz to 30Hz)
Extremely low frequency (ELF) radiation is electromagnetic radiation
defined by the ITU to be within the frequency range of
3Hz to 30Hz.
It is considered within the lower-frequency end of the
radio spectrum, or beyond (subradio).
It is adjacent to super low frequency and tremendously low frequency.
| || |
|9993km||30Hz||124×10-15eV||begin||extremely low frequency|
|99930km||3Hz||12×10-15eV||end||extremely low frequency|
super low frequency (SLF)
tremendously low frequency (TLF)