Electromagnetic Spectrum
The electromagnetic spectrum covers a wide range of wavelengths and photon energies. Light used to "see" an object must have a wavelength about the same size as or smaller than the object.
The ALS generates light in the far ultraviolet and soft x-ray regions, which span the wavelengths suited to studying molecules and atoms.
Electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation, which subsumes visible light, as well as invisible radiations such as radio waves, infrared light and X rays.
The "electromagnetic spectrum" of an object has a different meaning, and is instead the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.
Types of Electromagnetic Spectrum
Radio:
Your radio captures radio waves emitted by radio stations, bringing your favorite tunes. Radio waves are also emitted by stars and gases in space.
Microwave:
Microwave radiation will cook your popcorn in just a few minutes, but is also used by astronomers to learn about the structure of nearby galaxies.
Infrared:
Night vision goggles pick up the infrared light emitted by our skin and objects with heat. In space, infrared light helps us map thedust between stars.
Visible:
Our eyes detect visible light. Fireflies, light bulbs, and stars all emit visible light.
Ultraviolet:
Ultraviolet radiation is emitted by the Sun and are the reason skin tans and burns. "Hot" objects in space emit UV radiation as well.
X-ray:
A dentist uses X-rays to image your teeth, and airport security uses them to see through your bag. Hot gases in the Universe also emit X-rays.
Gamma ray:
Doctors use gamma-ray imaging to see inside your body. The biggest gamma-ray generator of all is the Universe.