The
Electromagnetic Spectrum
Designation |
Frequency Range |
Wavelength Range |
||
|
Lower |
Upper |
Lower |
Upper |
|
|
ULF |
none |
30 Hz |
10 Mm |
none |
|
VF |
30 Hz |
300 Hz |
1 Mm |
10 Mm |
|
ELF |
300 Hz |
3 kHz |
100 km |
1 Mm |
|
VLF |
3 kHz |
30 kHz |
10 km |
100 km |
|
LF |
30 kHz |
300 kHz |
1 km |
10 km |
|
MF |
300 kHz |
3 MHz |
100 m |
1 km |
|
HF |
3 MHz |
30 MHz |
10 m |
100 m |
|
VHF |
30 MHz |
300 MHz |
1 m |
10m |
|
UHF |
300 MHz |
3 GHz |
10 cm |
1 m |
|
SHF |
3 GHz |
30 GHz |
1 cm |
10 cm |
|
S |
2.6 |
3.95 |
7.6 |
11.5 |
|
G |
3.95 |
5.85 |
5.1 |
7.6 |
|
J |
5.3 |
8.2 |
3.7 |
5.7 |
|
H |
7.05 |
10.0 |
3.0 |
4.25 |
|
X |
8.2 |
12.4 |
2.4 |
3.7 |
|
M |
10.0 |
15.0 |
2.0 |
3.0 |
|
P |
12.4 |
18.0 |
1.67 |
2.4 |
|
K |
18.0 |
26.5 |
1.1 |
1.67 |
|
R |
26.5 |
40.0 |
0.75 |
1.1 |
|
EHF |
30 GHz |
300 GHz |
1 mm |
1 cm |
|
Submillimeter |
300 GHz |
3 THz |
100 mm |
1 mm |
|
Infrared |
3 THz |
430 THz |
700 nm |
100 mm |
|
Visible |
430 THz |
750 THz |
400 nm |
700 nm |
|
Ultraviolet |
750 THz |
30 PHz |
10 nm |
400 nm |
|
X Ray |
30 PHz |
3 EHz |
100 pm |
10 nm |
|
Gamma Ray |
3 EHz |
none |
none |
100 pm |
Source: NRL Plasma Formulary
Notes:
The boundary between ULF and VF (voice frequencies) is variously defined.
The SHF (microwave) band is further subdivided approximately as shown.
The Visible Spectrum
|
Color |
Wavelength Range [nm] |
|
|
lower |
upper |
|
|
Red |
630 |
780 |
|
Orange |
590 |
630 |
|
Yellow |
560 |
590 |
|
Green |
490 |
560 |
|
Blue |
450 |
490 |
|
Violet |
380 |
450 |
Source: http://www.adobe.com/support/techguides/color/colortheory/light.html
The Infrared Spectrum
|
Band |
Wavelength Range [mm] |
|
|
lower |
upper |
|
|
NIR (near IR) |
0.7 |
2.0 |
|
MIR (mid IR) |
2.0 |
25 |
|
FIR (far IR) |
25 |
1000 |
Source: http://scienceworld.wolfram.com/chemistry/InfraredSpectroscopy.html