Assertion: spectrum's wavelength | /r/HasProperty | absorbed by substance
Facets:
Source sentences:
text: 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.
text: In an absorption spectrum, some wavelengths of light are absorbed as they pass through a gas, forming a pattern of dark lines against a continuous background.