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ELECTROMAGNETIC FREQUENCY/ WAVELENGTH BANDS10

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Designation

Frequency Range

Wavelength Range

Lower

Upper

Lower

Upper

ULF*

 

30 Hz

10 Mm

 

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

10 m

UHF

300 MHz

3 GHz

10 cm

1 m

SHFf

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/xm

1 mm

Infrared

3 THz

430 THz

700 nm

100/mi

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

 

 

100 pm

In spectroscopy the angstrom is sometimes used (lA = 10 8 cm = 0.1 nm). *The boundary between ULF and VF (voice frequencies) is variously defined. fThe SHF (microwave) band is further subdivided approximately as shown.11

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Книги: 1908 А Б В Г Д Е З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Э Ю Я