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Physics in Action Electromagnetic Spectrum S32LS0619:26

Physics in Action Electromagnetic Spectrum S32LS06

Physics in Action, The Electromagnetic Spectrum.

The electromagnetic spectrum is the range of all the possible frequencies of known electromagnetic radiation (EM radiation or EMR), which is ultimately a form of radiant energy released by certain electromagnetic processes. Light, microwaves, X-rays, gamma- rays, emergency becon signals, satellite communications, radar and radio waves are all part of it.

Table 1Edit

Chart copied from the reinvent Wikipedia artical.

Class Frequency Wavelength Energy
 X and Gamma rays are Ionising. 300 EHz pm 1.24 MeV
γ Gamma rays
30 EHz 10 pm 124 keV
HX Hard X-rays
3 EHz 100 pm 12.4 keV
SX Soft X-rays
300 PHz nm 1.24 keV
30 PHz 10 nm 124 eV
EUV Extreme

ultraviolet

3 PHz 100 nm 12.4 eV
NUV Near_ultraviolet
Visible 300 THz μm 1.24 eV
NIR Near Infrared
30 THz 10 μm 124 meV
MIR Mid infrared
3 THz 100 μm 12.4 meV
FIR Far infrared
300 GHz mm 1.24 meV

Radio_waves (8-12 GHz for I and X band radars).

EHF Extremely_high_frequency
30 GHz cm 124 μeV
SHF Super_high_frequency
3 GHz dm 12.4 μeV
UHF Ultra_high_frequency
300 MHz m 1.24 μeV
VHF Very_high_frequency
30 MHz 10 m 124 neV
HF High_frequency
3 MHz 100 m 12.4 neV
MF Medium_frequency
300 kHz km 1.24 neV
LF Low_frequency
30 kHz 10 km 124 peV
VLF Very_low_frequency
3 kHz 100 km 12.4 peV
VF / ULF Voice_frequency
300 Hz Mm 1.24 peV
SLF Super_low_frequency
30 Hz 10 Mm 124 feV
ELF Extremely_low_frequency
3 Hz 100 Mm 12.4 feV

.

Table 2Edit

Chart copped from the reinvent Wikipedia artical.

Band name Abbreviation ITU band Frequency

and wavelength in air

Example uses
Tremendously low frequency TLF < 3 Hz

> 100,000 km

Natural and artificial electromagnetic noise
Extremely low frequency ELF 3–30 Hz

100,000 km – 10,000 km

Communication with submarines
Super low frequency SLF 30–300 Hz

10,000 km – 1000 km

Communication with submarines
Ultra low frequency ULF 300–3000 Hz

1000 km – 100 km

Submarine communication, communication within mines
Very low frequency VLF 4 3–30 kHz

100 km – 10 km

Navigationtime signals, submarine communication, wireless heart rate monitorsgeophysics
Low frequency LF 5 30–300 kHz

10 km – 1 km

Navigation, clock time signals, AM longwave broadcasting (Europe and parts of Asia), RFID,amateur radio
Medium frequency MF 6 300–3000 kHz

1 km – 100 m

AM (medium-wave) broadcasts, amateur radio, avalanche beacons
High frequency HF 7 3–30 MHz

100 m – 10 m

Shortwave broadcasts, citizens' band radio, amateur radio and over-the-horizon aviation communications, RFIDover-the-horizon radarautomatic link establishment (ALE) / near-vertical incidence skywave (NVIS) radio communications, marine and mobile radio telephony
Very high frequency VHF 8 30–300 MHz

10 m – 1 m

FMtelevision broadcasts and line-of-sight ground-to-aircraft and aircraft-to-aircraft communications, land mobile and maritime mobile communications, amateur radio, weather radio
Ultra high frequency UHF 9 300–3000 MHz

1 m – 100 mm

Television broadcasts, microwave ovenmicrowave devices/communications, radio astronomy,mobile phoneswireless LANBluetoothZigBeeGPS and two-way radios such as land mobile,FRS and GMRS radios, amateur radio
Super high frequency SHF 10 3–30 GHz

100 mm – 10 mm

Radio astronomy, microwave devices/communications, wireless LAN, most modern radars,communications satellites, satellite television broadcasting, DBS, amateur radio
Extremely high frequency EHF 11 30–300 GHz

10 mm – 1 mm

Radio astronomy, high-frequency microwave radio relay, microwave remote sensing, amateur radio, directed-energy weaponmillimeter wave scanner
Terahertz orTremendously high frequency THz or THF 12 300–3,000 GHz

1 mm – 100 μm

Terahertz imaging – a potential replacement for X-rays in some medical applications, ultrafast molecular dynamics, condensed-matter physicsterahertz time-domain spectroscopy, terahertz computing/communications, sub-mm remote sensing, amateur radio

.

Modern satellite imaging usesEdit

SPOT 6 and SPOT 7 are phased in the same orbit as Pléiades 1A and Pléiades 1B at an altitude of 694 km, forming a constellation of 2-by-2 satellites - 90° apart from one another.

  • Image product resolution:
    • Panchromatic: 1.5 m.
    • Colour merge: 1.5 m.
    • Multi-spectral: 6 m.
  • Spectral bands, with simultaneous panchromatic and multi-spectral acquisitions:
    • Panchromatic (450 – 745 nm).
    • Blue (450 – 525 nm).
    • Green (530 – 590 nm).
    • Red (625 – 695 nm).
    • Near-infrared (760 – 890 nm).
  • Other image data.
    • Footprint: 60 km × 60 km.
    • Responsive satellite tasking, with six tasking plans per day, per satellite.
    • Capacity to acquire up to 3 million km2 daily.

Also seeEdit

All About the Electromagnetic Spectrum06:26

All About the Electromagnetic Spectrum

All About the Electromagnetic Spectrum. How can you see the unseen through a thermal imaging camera?

  1. Blue Vixen Radar
  2. Ferranti Blue Fox Radar
  3. Westinghouse AN/APG-66 fire-control radar
  4. RAF Fylingdales
  5. The DEW Line
  6. Radar
  7. AN/FPS-108 Cobra Dane radar
  8. Thule Air Base, Greenland
  9. AEW&C
  10. Boeing RC-135 Cobra Ball
  11. Cold War radio jamming
  12. XTAR
  13. EMP
  14. Electromagnetic Pulse (EMP)
  15. POMCUS sites
  16. Nuclear fallout

Existential linksEdit

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