THE ELECTROMAGNETIC SPECTRUM
  Name Frequency Frequency Band
Designations		 Wavelength
Radio
Waves		 ELF   EW
-or-
ECM		 IEEE
-or-
RADAR		  
3 kHz (3×103 Hz) kilohertz 100 km (105)
VLF
   
30 kHz (3×104 Hz) A 10 km (104)
LF
   
300 kHz (3×105 Hz) 1 km (103) kilometer
MF
   
3 MHz (3×106 Hz) Megahertz 100 m (102) hectometer
HF
   
30 MHz (3×107 Hz) 10 m (10) dekameter
VHF
250 MHz  
B
300 MHz (3×108 Hz) 1 m meter
UHF
500 MHz  
C
1 GHz  
D L
2 GHz  
E S
3 GHz (3×109 Hz) Gigahertz 100 mm (1×10-1) decimeter
SHF F
4 GHz  
G C
6 GHz  
H
8 GHz  
I X
10 GHz  
J
12 GHz  
Ku
18 GHz  
K
20 GHz  
K
27 GHz  
Ka
30 GHz (3×1010 Hz ) 10 mm (1×10-2) centimeter
EHF
40 GHz  
L "millimeter"
60 GHz  
M
100 GHz  
300 GHz (3×1011 Hz) 1 mm (1×10-3) millimeter
   
(3×1012 Hz) Terahertz, THz 100 µm (1×10-4)
   
(3×1013 Hz) 10 µm (1×10-5)
Infra
-red		 far far
 

    6 µm
far  

    4 µm
middle  

    1.5 µm
near  
(3×1014 Hz) 1 µm (1×10-6) micrometer
(or micron)
 

    0.770 µm
Visible
Light		 red
 

    0.622 µm
orange
 

    0.597 µm
yellow
 

    0.577 µm
green
 

    0.492 µm
blue
 

    0.455 µm
violet
 

    0.390 µm
Ultra-
Violet		 near
 

    0.300 µm
far
 

    0.200 µm
far far
(3×1015 Hz) Petahertz, PHz 100 nm (1×10-7)
X-Rays  
(3×1016 Hz) 10 nm (1×10-8)
(3×1017 Hz) 1 nm (1×10-9) nanometer
(3×1018 Hz) Exahertz, EHz 100 pm (1×10-10) Angstrom, Å
(3×1019 Hz) 10 pm (1×10-11)
(3×1020 Hz) 1 pm (1×10-12) picometer
(3×1021 Hz) Zettahertz, ZHz 100 fm (1×10-13)
(3×1022 Hz) 10 fm (1×10-14)
Gamma
Rays		  
(3×1023 Hz) 1 fm (1×10-15) femtometer
(3×1024 Hz) Yottahertz, YHz 100 am (1×10-16)
(3×1025 Hz) 10 am (1×10-17)
(3×1026 Hz) 1 am (1×10-18) attometer
(3×1029 Hz) 1 zm (1×10-21) zeptometer
(3×1032 Hz) 1 ym (1×10-24) yoctometer

This is about the electromagnetic spectrum. For a complete discussion of the SI (metric) system, its units and its prefixes, you should read the Wiki about it, here: http://en.wikipedia.org/wiki/SI_prefix.

 
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