单词 | spectrum |
释义 | Word Frequency spectrum(ˈspɛktrəm) nounWord forms: plural -tra (-trə) 1. the distribution of colours produced when white light is dispersed by a prism or diffraction grating. There is a continuous change in wavelength from red, the longest wavelength, to violet, the shortest. Seven colours are usually distinguished: violet, indigo, blue, green, yellow, orange, and red 2. the whole range of electromagnetic radiation with respect to its wavelength or frequency 3. any particular distribution of electromagnetic radiation often showing lines or bands characteristic of the substance emitting the radiation or absorbing it See also absorption spectrum, emission spectrum 4. any similar distribution or record of the energies, velocities, masses, etc, of atoms, ions, electrons, etc a mass spectrum 5. any range or scale, as of capabilities, emotions, or moods 6. another name for an afterimage 7. on the spectrum Word origin C17: from Latin: appearance, image, from spectāre to observe, from specere to look at |
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