Electromagnetic Frequency Spectrum   Frequency (Wavelength) Name 0 Hertz Steady direct current 15-20,000 Hz Audio frequencies 30-15,000 Hz Normal human hearing range 16-4186.01 Hz Standard musical scales Note: - Audio is mechanical not electromagnetic   3-30 Hz (100-10Mm) e.l.f. - Extremely Low Frequency 30-300 Hz (10-1Mm) u.l.f. - Ultra Low Frequency 3-30 kHz (100,000-10,000m) v.l.f. - Very Low Frequency 10-16 kHz ultrasonic 30 kHz to 30,000 MHz Radio Frequencies 30-300 kHz (10,000-1000m) l.f. - low frequencies 30-535 kHz Marine com & navigation, aero nav. 300-3000 kHz (1000-100m) m.f. - medium frequencies 535-1705 kHz AM broadcast bands 1800-2000 kHz Amateur band, 160 meter 3-30 MHz (100-10m) h.f. - high frequencies 3.5-4 MHz Amateur band, 80 meter 7-7.3 MHz Amateur band, 40 meter 10.100-10.150 MHz Amateur band, 30 meter 14.1-14.35 MHz Amateur band, 20 meter 18.068-18.168 MHz Amateur band, 17 meter 21-21.45 MHz Amateur band, 15 meter 26.95-27.54 MHz Industrial, scientific, & medical 24.890-24.990 MHz Amateur band, 12 meter 28-29.7 MHz Amateur band, 10 meter 26.965-27.405 MHz Citizens Band (Class D) 30-300 MHz (10-1m) v.h.f. - very high frequencies 30-50 MHz Police, fire, forest, highway, railroad 50-54 MHz Amateur band, 6 meter 54-72 MHz TV channels 2 to 4 72-76 MHz Government, Aero. Marker 75MHz 76-88 MHz TV channels 5 and 6 88-108 MHz FM broadcast band 108-117.95 MHz Aeronautical navigation 118-135.95 MHz Civil Aviation Communication Band 148-174 MHz Government 144-148 MHz Amateur band, 2 meter 174-216 MHz TV channels 7 to 13 216-470 MHz Amateur, government, CB Band, non-government, fixed or mobile aeronautical navigation 220-225 MHz Amateur band, 1-1/4 meter 225-400 MHz Military 420-450 MHz Amateur band, 0.7 meter 462.55-563.20 MHz Citizens Band (Class A) 300-300 MHz (100-10cm) u.h.f. - ultra high frequencies 470-806 MHz TV channels 14 to 69 806-890 MHz Cellular telephone 890-3000 MHz Aero navigation, amateur bands, government & non-government, ixed and mobile 1300-1600 MHz Radar band 3000-30,000 MHz (10-1cm) s.h.f. - super high frequencies Government and non-government, amateur bands, radio navigation 30,000 MHz to 300 GHZ (1-0.1cm) Extra-high frequencies (weather radar, experimental, government) 30-0.76 :m Infrared light and heat 0.76-0.39 :m Visible light 6470-7000 ångstroms Red light 5850-6740 ångstroms Orange light 5750-5850 ångstroms Yellow light 5560-5750 ångstroms Maximum visibility 4912-5560 ångstroms Green light 4240-4912 ångstroms Blue light 4000-4240 ångstroms Violet light 0.39-0.032 :m Ultraviolet light 0.032-0.00001 :m X-rays 0.00001-0.0000006:m Gamma rays 0.0005 ångstroms Cosmic rays   :m = micrometer 10^-6 m): m = meter: cm = centimeter Hz = hertz: MHz = megahertz (10^6 Hz): kHz = kilohertz (10^3 Hz) ghZ = GIGAHERTZ (10^9 Hz): 1 ångstrom = 10^-10 meters