Assertion: elf | /r/HasProperty | low frequency
Facets:
value: extremely
type: DEGREE
Source sentences:
text: Explore our growing selection of articles on the use and misuse of ELF (Extremely Low Frequency), as well as other forms of radio research and variable frequency phenomena.
text: ELF (extremely low frequency) refers to an electromagnetic field having a frequency much lower than the frequencies of signals typically used in communications.