Assertion: radio wave's frequency | /r/HasProperty | elf
Facets:
Source sentences:
text: Band Frequency range Wavelength range Extremely Low Frequency (ELF)
text: Some medical peer reviewed journal articles refer to ELF in the context of "extremely low frequency (ELF) magnetic fields (MF)" with frequencies of 50 Hz and 50–80 Hz.
text: Extremely Low Frequency (ELF)
text: As the frequency gets lower, the attenuation with distance decreases, so very low frequency (VLF) and extremely low frequency (ELF)