In physics, a spectrum represents the distribution of a physical quantity, such as [[Light|light]], sound, or [[Energy|energy]], over a range of values. The [[Electromagnetism|electromagnetic]] spectrum includes radio waves, visible light, and gamma rays, ordered by wavelength or frequency. ![[spectrum_light.excalidraw.light.svg]] Light spectra come in three types. A continuous spectrum displays all [[Wavelength|wavelengths]] without gaps. An emission spectrum shows bright lines at specific wavelengths emitted by a substance. An absorption spectrum has dark lines where certain wavelengths are absorbed. These patterns help identify elements in stars and materials. Sound spectra analyze frequencies in acoustics, while energy spectra in quantum mechanics describe discrete or continuous energy levels. Mass spectra, used in chemistry, identify substances based on mass-to-charge ratios. Spectra provide essential insights into the properties of matter and energy across various scientific fields. >[!read]- Further Reading >[!ref]- References