Definitions of Astronomical Wavelength Regions

name
 
wavelength
[m]
frequency
[Hz]
energy
[eV]
 
gamma-ray   1.1 x 1020 Hz - > 2.4 x 1028 Hz 511 keV - > 100 TeV
ultra high energy (UHE)
very high energy (VHE)
high energy
medium energy
low energy
    > 100 TeV
100 GeV - 100 TeV
1 GeV - 100 GeV
100 MeV - 1 GeV
511 keV -100 MeV
x-ray 0.02 nm - 12 nm   100 eV - 511 keV
hard x-rays
soft x-rays
    50 keV - 511 keV
100 eV - 50 keV
extreme ultraviolet
(EUV)
12 nm - 91.2 nm    
ultraviolet 91.2 nm - 320 nm    
optical 320 nm - 700 nm 9.4 x 1014 Hz - 4.3 x 1014 Hz  
U
B
V
H-alpha
R
365 nm
440 nm
550 nm
656 nm
700 nm
   
infrared 700 nm - 1 mm    
near infrared
I
J
K
L
mid infrared
M
N
Q
far infrared
sub millimeter
700 nm - 4 µm
900 nm
1.2 µm
2.2 µm
3.4 µm
4 µm - 40 µm
5.0 µm
10.2 µm
21 µm
40 µm - 300 µm
300 µm - 1 mm
   
radio >1 mm < 300 GHz < 1.24 x 10-3 eV

Unit conversions:

1 m   <=> 2.998 x 108 Hz   <=> 1.240 x 10-6 eV  
1 mm (= 10-3 m) <=> 2.998 x 1011 Hz   <=> 1.240 x 10-3 eV  
1 µm (= 10-6 m) <=> 2.998 x 1014 Hz   <=> 1.240 eV  
1 nm (= 10-9 m) <=> 2.998 x 1017 Hz   <=> 1.240 x 103 eV  
1 Å (= 10-10 m) <=> 2.998 x 1018 Hz   <=> 1.240 x 104 eV  
2.998 x 108 m   <=> 1 Hz   <=> 4.136 x 10-15 eV  
2.998 x 105 m   <=> 1 kHz (= 103 Hz) <=> 4.136 x 10-12 eV  
2.998 x 102 m   <=> 1 MHz (= 106 Hz) <=> 4.136 x 10-9 eV  
2.998 x 10-1 m   <=> 1 GHz (= 109 Hz) <=> 4.136 x 10-6 eV  
1.240 x 10-6 m   <=> 2.418 x 1014 Hz   <=> 1 eV  
1.240 x 10-9 m   <=> 2.418 x 1017 Hz   <=> 1 keV (= 103 eV)
1.240 x 10-12 m   <=> 2.418 x 1020 Hz   <=> 1 MeV (= 106 eV)
1.240 x 10-15 m   <=> 2.418 x 1023 Hz   <=> 1 GeV (= 109 eV)
1.240 x 10-18 m   <=> 2.418 x 1026 Hz   <=> 1 TeV (= 1012 eV)
1.240 x 10-21 m   <=> 2.418 x 1029 Hz   <=> 1 PeV (= 1015 eV)

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Impressum
last update: 2013-04-05
editor: Helmut Steinle