Spectrum Definition in Chemistry

Prism with light
A spectrum is a set of wavelengths of light or electromagnetic radiation.

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A spectrum is defined as the characteristic wavelengths of electromagnetic radiation (or a portion thereof) that is emitted or absorbed by an object or substance, atom, or molecule.

Plural: Spectra

Example

Examples of a spectrum include the rainbow, the emission colors from the Sun, and the infrared absorption wavelengths from a molecule.