---------- *SPECTRUM* ---------- Electromagnetic Spectrum Minimum Maximum Typical Cycles/Sec Cycles/Sec Wavelength ELF (Ext. Low Freq., Power Lines) 10**0 10**3 3000 miles VLF (Very Low Freq., AM Radio) 10**3 10**7 1000 feet VHF (Very High Freq., TV) 10**8 10**9 10 feet Microwaves (Radar, Microwaves) 10**9 10**11 1 inch Infrared 10**12 10**14 10**-3 inch Visible Light 10**15 10**15 10**-5 inch Ultraviolet (ionizing) 10**15 10**17 10**-6 inch X-Rays (ionizing) 10**16 10**21 10**-10 inch Gamma Rays (ionizing) 10**19 10**22 10**-11 inch Source: Derived from Washington Post, Dec. 16, 1987, page D3