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hydrogen spectrum
(physics) all the lines in the emission or absorption spectrum of hydrogen; each one corresponding to an allowed transition between quantum energy levels
visible spectrum
(physics) The portion of the electromagnetic spectrum which is visible to the human eye (red, orange, yellow, green, blue, and violet).
nuclear spectrum
(physics) The distribution of the intensity of particles or radiation emitted in a nuclear process as a function of energy - a unique signature of each process.
broad-spectrum
autism spectrum
The range of conditions classified as pervasive developmental disorders, generally held to include autistic disorder, Asperger syndrome, and pervasive developmental disorder - not otherwise specified (PDD-NOS). Also includes childhood disintegrative disorder and Rett syndrome.
spectrum disorders
autistic spectrum
band spectrum
(physics) An absorption or emission spectrum consisting of bands of closely-spaced lines; characteristic of polyatomic molecules.
autism spectrum disorders
first-order spectrum
(physics) A spectrum produced by a diffraction grating whose adjacent slits are one wavelength apart.