Ultra low frequency (ULF) is the ITU designation for the frequency range of electromagnetic waves between 300 hertz and 3 kilohertz , corresponding to wavelengths between 1,000 to 100 km.
Ultra low frequency (ULF) is the ITU designation for the frequency range of electromagnetic waves between 300 hertz and 3 kilohertz , corresponding to wavelengths between 1,000 to 100 km.