Absorption spectrum
Definition
Absorption spectrum is a graph or display showing the absorption of light at different wavelengths by a material. It reveals the specific wavelengths absorbed by atoms or molecules, corresponding to their energy levels.
5 Must Know Facts For Your Next Test
- An absorption spectrum appears as a series of dark lines or bands superimposed on a continuous spectrum.
- It is produced when light passes through a gas or liquid and specific wavelengths are absorbed by the atoms or molecules.
- The dark lines in an absorption spectrum correspond to the wavelengths of light that have been absorbed.
- Each element has a unique absorption spectrum, acting like a fingerprint for identifying substances.
- Absorption spectra are important tools for studying the composition and properties of astronomical objects.
Review Questions
- What causes the dark lines in an absorption spectrum?
- How can astronomers use an absorption spectrum to identify elements in distant stars?
- Why does each element have a unique absorption spectrum?
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Related terms
Emission Spectrum: A graph showing the wavelengths of light emitted by an atom or molecule, appearing as bright lines on a dark background.
Spectroscopy: The study of how matter interacts with electromagnetic radiation, used to analyze light from astronomical objects.
Continuous Spectrum: A seamless range of colors (wavelengths) without any gaps, typically produced by solid, liquid, or dense gaseous sources.
