The "t" in tremendous matches the "t" in terahertz (the geometric mean of the band), matches the "t" in twelve (1 THz = 10 12 Hz), matches the "t" in trillion (10 12 is also known as a trillion). ‡ This designation is not official, but I like it.
Thus low frequency (LF) is also called long wave (LW), medium frequency (MF) is also called medium wave (MW), and high frequency (HF) is also called short wave (SW). † The middle bands are sometimes identified by their relative wavelengths. Thus ELF on the table above is ELF1, SLF is ELF2, and ULF is ELF3. Radio Frequency Bands 1 International Telecommunication Union * The ITU actually assigns the designation ELF to everything below VLF.
micropulsations, electric power transmission, analog audio signals, radio transmission, microwaves.small, almost sinusoidal fluctuations of the geomagnetic field, usually with durations of seconds to minutes.A good, general sequence to remember is radio waves, microwaves, infrared, light, ultraviolet, x-rays, gamma rays micropulsations
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