The Entire 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.