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What (who) is electromagnetic spectrum - definition

ENTIRE RANGE AND SCOPE OF FREQUENCIES OF ELECTROMAGNETIC RADIATION

Electromagentic spectra; Light spectrum; Spectrum of light; EM spectrum; EM Spectrum; Electromagnetic Spectrum; Electrocmagnetic spectrum; Em spectrum; Solar Light; Radiation spectrum; Electomagnetic spectrum; Electro-magnetic spectrum; Electro magnetic spectrum; Electromagnetic frequency spectrum; Spectral range; Invisible light (physics); Electromagnetic band; EM band; Low visible light

Spectrum (functional analysis)

TERM USED IN FUNCTIONAL ANALYSIS

Approximate eigenvalue; Operator spectrum; Spectrum of an operator; Compression spectrum; Spectral representation; Point spectrum; Continuous spectrum (functional analysis)

In mathematics, particularly in functional analysis, the spectrum of a bounded linear operator (or, more generally, an unbounded linear operator) is a generalisation of the set of eigenvalues of a matrix. Specifically, a complex number λ is said to be in the spectrum of a bounded linear operator T if T-\lambda I is not invertible, where I is the identity operator.

https://en.wikipedia.org/wiki/Spectrum_(functional_analysis)

spectrum

CONTINUOUS RANGE OF VALUES, SUCH AS WAVELENGTHS IN PHYSICS

Energy spectrum; Spectracular; Energy spectra; Spectroscopic observations; Spectral density (physical science); Spectrum of disease; Spectrum (physics)

(spectra, or spectrums)

1.

The spectrum is the range of different colours which is produced when light passes through a glass prism or through a drop of water. A rainbow shows the colours in the spectrum.

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2.

A spectrum is a range of a particular type of thing.

Politicians across the political spectrum have denounced the act...

The term 'special needs' covers a wide spectrum of problems.

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3.

A spectrum is a range of light waves or radio waves within particular frequencies.

Vast amounts of energy, from X-rays right through the spectrum down to radio waves, are escaping into space...

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spectrum

CONTINUOUS RANGE OF VALUES, SUCH AS WAVELENGTHS IN PHYSICS

Energy spectrum; Spectracular; Energy spectra; Spectroscopic observations; Spectral density (physical science); Spectrum of disease; Spectrum (physics)

n.

Image, appearance, representation.

Wikipedia

Electromagnetic spectrum

The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.

The electromagnetic spectrum covers electromagnetic waves with frequencies ranging from below one hertz to above 10²⁵ hertz, corresponding to wavelengths from thousands of kilometers down to a fraction of the size of an atomic nucleus. This frequency range is divided into separate bands, and the electromagnetic waves within each frequency band are called by different names; beginning at the low-frequency (long-wavelength) end of the spectrum these are: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays at the high-frequency (short wavelength) end. The electromagnetic waves in each of these bands have different characteristics, such as how they are produced, how they interact with matter, and their practical applications. There is no known limit for long and short wavelengths. Extreme ultraviolet, soft X-rays, hard X-rays and gamma rays are classified as ionizing radiation because their photons have enough energy to ionize atoms, causing chemical reactions. Exposure to ionizing radiation can be a health hazard, causing radiation sickness, DNA damage and cancer. Radiation of visible light and longer wavelengths are classified as nonionizing radiation because they have insufficient energy to cause these effects.

Throughout most of the electromagnetic spectrum, spectroscopy can be used to separate waves of different frequencies, producing a spectrum of the constituent frequencies. Spectroscopy is used to study the interactions of electromagnetic waves with matter.

https://en.wikipedia.org/wiki/Electromagnetic spectrum

Examples of use of electromagnetic spectrum

1. Radio waves are just next to microwaves on the electromagnetic spectrum and I‘m not worried about listening to Radio 4 either.

2. "Israel has an unusual problem involving to the electromagnetic spectrum, because of the crowding on communication frequencies the defense establishment utilizes," says Itzhak Ish–Horowitz of the Interdisciplinary Center for Technological Analysis and Forecasting at Tel Aviv University.

3. "What I‘m looking for is a way to shoot everybody, and they‘re all OK." Almost as diverse as the electromagnetic spectrum itself, directed–energy weapons span a wide range of incarnations.

4. TeraView, a company in Cambridge, the National Physical Laboratory and Qinetiq, the defence research company, are among the many groups investigating the possible security applications of this unexploited part of the electromagnetic spectrum.

5. Scientists measure cosmic distances via redshift, the extent to which light is "shifted" toward the red, or lower energy, part of the electromagnetic spectrum during the light‘s long journey across the Universe.