Appendix C 



CONVERSIONS: WAVELENGTH/FREQUENCY 



Domain Wavelength Frequency (GHz) 



Radio >1 cm <30 



Millimeter 1-10 mm 300-30 



Submillimeter 600-1 000 jum 500-300 



Far-infrared 2-600 jum 1.5X10 5 -500 



Near-infrared 0.7-2 jum 4-1.5X10 5 



Visible 4000-7000 A 7.5-4X1 5 



Ultraviolet 2000-4000 A 1.5-0.75X10 6 



Far-ultraviolet 100-2000 A 3-0.1 5X10 7 



X-ray 1-1 00 A 3-0.03X1 9 



Gamma ray <1 A >3X10 9 



1 jum = 1 0~ 6 m 



1 A = 1 0" 8 m 



1 Hz = 1 cycle/sec 



1 GHz= 10 9 Hz 



1 Jy= 10~ 26 W/m 2 /Hz 



log [f v (in jy)] = -0.4 m v + 3.57 



m v = 20 is equivalent to f v = 4X 1 5 J y 



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