Extremely low frequency

Bands of radio waves BandFrequency rangeWavelength rangeMedium Frequency (MF)300 kHz to 3 MHz100 m to 1 kmHigh Frequency (HF)3 to 30 MHz10 to 100 mVery High Frequency (VHF)30 to 300 MHz1 to 10 mUltra High Frequency (UHF)300 MHz to 3 GHz10 cm to 1 mWhat Are Radio Waves? | Live Science www.livescience.com › 50399-radio-waves

MEDIUM-FREQUENCY alternating currents (MFACs), defined as currents in the frequency range 1 to 10kHz, are used extensively in rehabilitation . Clayton’s electrotherapy.

Medium Frequency (MF): 300-3000 kHz Because medium frequencies afford stable transmission of radio waves over long distances, they are used primarily for medium wave broadcasting (AM radio), ship communications, LORAN (radio navigation), and other applications.