Wiktionary
n. (context physics English) The entire range of wavelengths of all known electromagnetic radiations extending from gamma rays through visible light, infrared, and radio wave, to X-ray.
WordNet
n. the entire frequency range of electromagnetic waves
Wikipedia
colspan=3 | Class
Freq-uency
Wave-length
Energy
rowspan=11 | Ionizingradiation
rowspan=3 | γ
rowspan=3 | Gamma rays
300 EHz
30 EHz
10 pm
124 keV
rowspan=2 | HX
rowspan=2 | Hard X-rays
3 EHz
100 pm
12.4 keV
rowspan=4 | SX
rowspan=4 | Soft X-rays
300 PHz
1 nm
1.24 keV
30 PHz
10 nm
124 eV
rowspan=2 | EUV
rowspan=2 | Extremeultraviolet
3 PHz
100 nm
12.4 eV
rowspan=2 | NUV
rowspan=2 | Nearultraviolet
rowspan=2 style="background:linear-gradient(to bottom,#f6f 0%,#0ff 30%,#ff0 80%,#f66 100%);" | Visible
300 THz
1 μm
1.24 eV
rowspan=2 | NIR
rowspan=2 | Near infrared
30 THz
10 μm
124 meV
rowspan=2 | MIR
rowspan=2 | Mid infrared
3 THz
100 μm
12.4 meV
rowspan=2 | FIR
rowspan=2 | Far infrared
300 GHz
1 mm
1.24 meV
rowspan=16 | Micro-waves
and
radiowaves
rowspan=2 | EHF
rowspan=2 | Extremely highfrequency
30 GHz
1 cm
124 μeV
rowspan=2 | SHF
rowspan=2 | Super highfrequency
3 GHz
1 dm
12.4 μeV
rowspan=2 | UHF
rowspan=2 | Ultra highfrequency
300 MHz
1 m
1.24 μeV
rowspan=2 | VHF
rowspan=2 | Very highfrequency
30 MHz
10 m
124 neV
rowspan=2 | HF
rowspan=2 | Highfrequency
3 MHz
100 m
12.4 neV
rowspan=2 | MF
rowspan=2 | Mediumfrequency
300 kHz
1 km
1.24 neV
rowspan=2 | LF
rowspan=2 | Lowfrequency
30 kHz
10 km
124 peV
rowspan=2 | VLF
rowspan=2 | Very lowfrequency
3 kHz
100 km
12.4 peV
rowspan=2 | ULF
rowspan=2 | Ultra low frequency
300 Hz
1 Mm
1.24 peV
rowspan=2 | SLF
rowspan=2 | Super lowfrequency
30 Hz
10 Mm
124 feV
rowspan=3 | ELF
rowspan=3 | Extremely lowfrequency
3 Hz
100 Mm
12.4 feV
colspan=7 | Sources: :File:Light spectrum.svg
The electromagnetic spectrum is the collective term for all known frequencies and their linked wavelengths of the known photons ( electromagnetic radiation ). The "electromagnetic spectrum" of an object has a different meaning, and is instead the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.
The electromagnetic spectrum extends from below the low frequencies used for modern radio communication to gamma radiation at the short- wavelength (high-frequency) end, thereby covering wavelengths from thousands of kilometers down to a fraction of the size of an atom. Visible light lies toward the shorter end, with wavelengths from 400 to 700 nanometres. The limit for long wavelengths is the size of the universe itself, while it is thought that the short wavelength limit is in the vicinity of the Planck length. Until the middle of the 20th century it was believed by most physicists that this spectrum was infinite and continuous.
Nearly all types of electromagnetic radiation can be used for spectroscopy, to study and characterize matter. Other technological uses are described under electromagnetic radiation.
Usage examples of "electromagnetic spectrum".
It may be that the lower light vibration - the one that falls within the electromagnetic spectrum and therefore guides our perception - decodes the higher vibration of the quantum hologram.
For instance, a black hole as light as a small asteroid would emit about as much radiation as a million-megaton hydrogen bomb, with radiation concentrated in the gamma-ray part of the electromagnetic spectrum.
All the high, dry sites around the globe were now thronged with telescopes that spied upward in every band of the electromagnetic spectrum: radio to gamma ray, with many stops in between.
They have no fire, either, so they cannot 'see' the electromagnetic spectrum like other creatures do.
And the elements of the second triad of the periodic table proved to be a key to the use of his new spectrum, a kind of imperfect philosophers' stone, as iron and nickel and cobalt had always been to the sister energies of the electromagnetic spectrum.
Therefore we should be able to communicate by optical techniques, using the part of the electromagnetic spectrum visible to humans.
Ozma went wrong: they were only looking for signals in the electromagnetic spectrum.
That's where Project Ozma went wrong: they were only looking for signals in the electromagnetic spectrum.
Electrons chittered all over the electromagnetic spectrum, violently roiling in the aftermath of the weapon.
Under controlled conditions, I could not generate the least attoerg of detectable energy anywhere in the electromagnetic spectrum let alone produce a coherent laserlike beam.
And may the Prophets ensure that neither the planetary sensors nor the spoon-heads will think to check the electromagnetic spectrum for low-tech radio broadcasts, breathed Joson Wabak silently.
Imperial technology was EMP-proof, but they'd counted on lighter weapons, with less ruinous effect on the electromagnetic spectrum, and she only hoped the targeting data had gotten through .