noun (plural spectra /-trə/ or spectrums)
- 1A band of colours, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength.More example sentences
- If viewed through a prism, however, there is a decomposition of the light into the colors of the spectrum, each with different wavelengths.
- He has used the spectrum of colours in the rainbow effectively to create an atmosphere of calm.
- He is shown seated before his famous invention: a ruling machine for producing concave diffraction gratings, which are slightly curved metal plates scored with minutely spaced lines that diffract light into spectra.
- 1.1 (the spectrum) The entire range of wavelengths of electromagnetic radiation.More example sentences
- Light, the diet of eyes, constitutes a tiny part of the entire spectrum of electromagnetic radiation.
- In the meantime over twenty presentations internationally have moved to show that across the spectrum electromagnetic fields are genotoxic, that is they damage DNA.
- But apricot can add a spring-like touch as well, since it falls more in the yellow-orange range of the spectrum.
- 1.2A characteristic series of frequencies of electromagnetic radiation emitted or absorbed by a substance.More example sentences
- The adsorption and emission of spectra characteristic of atoms also suggested that they were due to the oscillations of charged particles on the atomic or sub-atomic scale.
- One method they use, fluorescence spectroscopy, involves recording optical spectra from molecules absorbing and emitting light.
- It should be noted that immunoglobulins often can be found throughout the electrophoretic spectrum.
- 1.3The components of a sound or other phenomenon arranged according to such characteristics as frequency, charge, and energy.More example sentences
- The properties ascribed to electrons, for instance, such as their charge and half-integral spin, were themselves responses to quite specific experimental findings involving discharge tube phenomena and spectra.
- The height of the spectrum indicates the extent of that frequency's contribution to the variance of the growth rate.
- Radio spectrum can also be mapped in other ways, onto territory.
- 2Used to classify something in terms of its position on a scale between two extreme points: the left or the right of the political spectrumMore example sentences
- Modern biology has come to occupy an extreme position in the spectrum of the sciences, dominated by historical explanations of the evolutionary adventures of genes.
- But, largely thanks to the Blairite project, the gap that separates the Tories and Labour has dramatically moved its position on the political spectrum.
- If Churchill is so violently attacked by both extremes of the political spectrum, we can assume that he cannot have been that bad.
- 2.1A wide range: self-help books are covering a broader and broader spectrumMore example sentences
- The budding writers touched upon a wide spectrum of issues ranging from suspense, fantasy, ghosts, sporting rivalry to philosophy and science fiction.
- You've seen their work in a wide spectrum of venues ranging from Fast Forward to Time magazine, and now you can see it in person.
- Economic geography supposedly has a wide spectrum of subjects, ranging from agrarian and pastoral economies to resource utilization and changes in land use.
early 17th century (in the sense 'spectre'): from Latin, literally 'image, apparition', from specere 'to look'.