Definition, Meaning, Synonyms & Anagrams | English word SPECTRUM

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Definitions of SPECTRUM

1. A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
2. The image of something seen that persists after the eyes are closed.
3. Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc. [from later 17th c.]
4. (psychology, education, usually with the) The autism spectrum.
5. (chemistry) The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
6. (mathematics, linear algebra) The set of eigenvalues of a matrix.
7. (mathematics, functional analysis) Of a bounded linear operator A, the set of scalar values λ such that the operator A—λI, where I denotes the identity operator, does not have a bounded inverse; intended as a generalisation of the linear algebra sense.
8. (obsolete) Specter, apparition. [from early 17th c.]
9. (commutative algebra, algebraic geometry) An abstract object in mathematics created from a commutative ring and denoted or and said to be the spectrum of ; useful in the study of such rings for providing a geometric object which encodes many of the properties , and in modern geometry for generalizing the notion of an algebraic variety to that of an affine scheme. Formally, the set of all prime ideals equipped with the Zariski topology and augmented with a sheaf of rings called the structure sheaf, generated by the B-sheaf on the distinguished open sets which assigns the localization of at to each set , regarded as a ring of functions on . See

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Examples of Using SPECTRUM in a Sentence

• It may refer more specifically to two subcategories: Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum.
• For example, the spectrum of an element of a nontrivial complex Banach algebra can never be empty, whereas in a real Banach algebra it could be empty for some elements.
• Bipolar I disorder (BD-I; pronounced "type one bipolar disorder") is a type of bipolar spectrum disorder characterized by the occurrence of at least one manic episode, with or without mixed or psychotic features.
• Color (American English) or colour (British and Commonwealth English) is the visual perception based on the electromagnetic spectrum.
• Chlorophylls absorb light most strongly in the blue portion of the electromagnetic spectrum as well as the red portion.
• To permit this without undue interference between the users, CDMA employs spread spectrum technology and a special coding scheme (where each transmitter is assigned a code).
• Over the years, the term dementia praecox was gradually replaced by the term schizophrenia, which initially had a meaning that included what is today considered the autism spectrum.
• In studies, it has been used alongside psychotherapy in the treatment of post-traumatic stress disorder (PTSD) and social anxiety in autism spectrum disorder.
• The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength.
• Emission spectrum, the spectrum of frequencies of electromagnetic radiation generated by molecular electrons making transitions to lower energy states.
• The time domain signals are illustrated above, and the corresponding spectra are shown below (spectrum amplitudes in dB).
• Its spectrum, the system's energy spectrum or its set of energy eigenvalues, is the set of possible outcomes obtainable from a measurement of the system's total energy.
• Moseley's law advanced atomic physics, nuclear physics and quantum physics by providing the first experimental evidence in favour of Niels Bohr's theory, aside from the hydrogen atom spectrum which the Bohr theory was designed to reproduce.
• It was discovered in 1863 by Ferdinand Reich and Hieronymous Theodor Richter by spectroscopic methods and named for the indigo blue line in its spectrum.
• The infrared spectral band begins with waves that are just longer than those of red light (the longest waves in the visible spectrum), so IR is invisible to the human eye.
• Its role is to manage the international radio-frequency spectrum and satellite orbit resources and to develop standards for radiocommunication systems with the objective of ensuring the effective use of the spectrum.
• The ISM radio bands are portions of the radio spectrum reserved internationally for industrial, scientific, and medical (ISM) purposes, excluding applications in telecommunications.
• Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz.
• Within the left–right political spectrum, Left and Right were coined during the French Revolution, referring to the seating arrangement in the French National Assembly.
• It describes the spectrum of disorders and pathophysiology of newborns born in meconium-stained amniotic fluid (MSAF) and have meconium within their lungs.

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