Spectrum

See electromagnetic spectrum, optical spectrum.

The range of electromagnetic radio frequencies used in the transmission of sound, data and television.

Electromagnetic radiation arranged in order of wavelength from Ion wavelength radio waves to short wavelength gamma rays. A rainbow is a natural spectrum of visible light from the Sun. Spectra are often punctuated by emission or absorption lines, which can be examined to reveal the composition and motion of the radiating source.

see Solar Spectrum above.