You searched for: “spectrum”
Chemical Element: praseodymium
(Greek: prasios, "green", plus didymos, "twin" [with the element neodymium] because of a green line in its spectrum; rare earth)
Chemical Element: rubidium
(Modern Latin: from Latin rubidus, "red"; from the red lines in its spectrum; metal)
Chemical Element: thallium
(Modern Latin: from Greek, thallos, "a young, or green, twig or shoot" [based on the color of its spectrum]; metal)
English-Word Etymology Info about a Wide Spectrum of English Words
(English Comes from Many Sources)
Word Entries containing the term: “spectrum”
absorption spectrum
Spectrum of absorption lines produced when light passes through and is partially absorbed by a substance.
This entry is located in the following units: sorb-, sorpt- + (page 3) -um (page 1)
beta-decay spectrum
The distribution in energy or momentum of the beta particles arising from a nuclear disintegration process.
This entry is located in the following unit: beta; B, β + (page 3)
electromagnetic spectrum
1. The ordered sequence of all known forms of electromagnetic radiations, extending from the shortest cosmic rays through gamma rays, X-rays, ultraviolet radiation, visible radiation, and infrared radiation, and including microwaves and all other wavelengths of radio energy.
2. The entire range of different types of electromagnetic waves, extending from the very long, low-frequency radio waves, through infrared and light waves, to the very short, high-frequency cosmic rays and X-rays which can be generated physically.

This range of electromagnetic wavelengths extends almost from zero to infinity and includes the visible portion of the spectrum known as light.

3. A list, chart, graph, or diagram showing the relationships among all known types or range of electromagnetic radiation including the range of frequencies and wavelengths.
4. The total range of wavelengths, extending from the shortest to the longest wavelength or conversely, that can be generated physically.

This range of electromagnetic wavelengths extends practically from zero to infinity and includes the visible portion of the spectrum known as light.

This entry is located in the following unit: electro-, electr-, electri- (page 41)
electron spectrum
1. A diagram, a graph, or other display indicating the intensity of electrons emitted by an irradiated substance with respect to the kinetic energy of the electrons.
2. A visual display, photograph, or graphical plot of the intensity of electrons emitted from a substance bombarded by X-rays or other radiation as a function of the kinetic energy of the electrons.
This entry is located in the following unit: electro-, electr-, electri- (page 52)
electronic absorption spectrum
Any spectrum produced by the absorption of electromagnetic radiation by ions, atoms, or molecules as a result of electron excitation.
This entry is located in the following units: electro-, electr-, electri- (page 58) -tron, -tronic, -tronics + (page 6)
electronic band spectrum
1. A spectrum characteristic of molecules that consists of bands of spectral lines corresponding to electron transitions accompanied by vibrational or rotational transitions.
2. Bands of spectral lines connected with a change of electronic state of a molecule.

Each band is corresponding to vibrational energies in the initial and final conditions and each band consists of numerous rotational lines.

This entry is located in the following units: electro-, electr-, electri- (page 58) -tron, -tronic, -tronics + (page 6)
electronic emission spectrum
1. Any spectrum produced by the emission of electromagnetic radiation by atoms, molecules, or ions, because of electron excitation or the signal voltage that is applied to the control electrode of an electron tube.
2. A spectrum resulting from the emission of electromagnetic radiation by ions, atoms, and molecules following excitations of their electrons.
This entry is located in the following units: electro-, electr-, electri- (page 62) -tron, -tronic, -tronics + (page 9)
electronic spectrum
1. A spectrum produced by the absorption or emission of electromagnetic radiation resulting only from electron transitions, rather than from vibrational, rotational, or other types of transitions.
2. The spectrum resulting from emission or absorption of electromagnetic radiation during changes in the electron configuration of atoms, ions, or molecules, as opposed to vibrational, rotational, fine-structure, or hyperfine spectra.
This entry is located in the following unit: electro-, electr-, electri- (page 68)
ionic spectrum, spark spectrum
1. The spectrum produced by a spark discharging through a gas or vapor.

With metal electrodes, a spectrum of the metallic vapor is obtained.

This entry is located in the following unit: ion, ion- + (page 6)
visible spectrum
A spectrum having wavelengths in the visible region of the electromagnetic spectrum (a continuous distribution of colored light produced when a beam of white light is dispersed into its components; such as, by a prism).
This entry is located in the following unit: vid-, video-, vis-, -vision, -visional, -visionally, visuo-, vu- (page 15)
Word Entries at Get Words: “spectrum”
spectrum (s), spectra (pl)
1. The study of spectral lines from different atoms and molecules which is an important part of studying the chemistry that goes on in stars and in interstellar clouds.
2. The splitting up of electromagnetic radiations into the constituent wavelengths.

Atoms can exist in a number of discreet energy levels and they emit or absorb photons when they make transitions from one level to another.

The energies of the photons emitted or absorbed by one atom are different from those of all of the other atoms.

The photon energies are directly related to their frequencies, which set their colors in the spectrum, so by observing the colors of the photons, it is possible to determine which atoms are being observed.

This can be done in a laboratory, and it can also be done with the light reaching us from stars, near or distant, which enables us to identify the atoms that stars are made of.

This entry is located in the following unit: Astronomy and related astronomical terms (page 24)
Word Entries at Get Words containing the term: “spectrum”
absorption spectrum
The spectrum resulting when light from one source is passed through another material; for example, a tenuous gas.

The result is a series of dark bands crossing the spectrum, known as absorption lines.

This entry is located in the following unit: Astronomy and related astronomical terms (page 1)
electromagnetic spectrum
1. The whole range of radiation which extends from high-energy gamma rays to low-energy radio waves.
2. The range of wavelengths, or frequencies, over which electromagnetic radiation is propagated.

The longest wavelengths, or lowest frequencies, are those of radio waves, and the shortest wavelengths are those of gamma rays.

This entry is located in the following unit: Astronomy and related astronomical terms (page 9)
emission spectrum
The spectrum formed by the emission of electromagnetic radiation by a source; such as, a star.
This entry is located in the following unit: Astronomy and related astronomical terms (page 10)