Electromagnetic spectrum

thumb|Natural color X-ray photogram of a wine scene. Note the edges of hollow cylinders as compared to the solid candle. thumb|William D. Coolidge|William Coolidge explains medical imaging and X-rays.

Ultraviolet radiation (UV; sometimes called ultraviolet light) is electromagnetic radiation of wavelengths of 100–400 nanometers, shorter than that of visible light, but longer than X-rays. Wavelengths between 10 and 100 nanometers are called extreme ultraviolet and share some properties with soft X-rays. UV radiation is present in sunlight and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights.

thumb|A false color|false-color image of two people taken in long-wavelength infrared (body-temperature thermal) radiation Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with the waves that are just longer than those of red light (the longest waves in the visible spectrum), so IR is invisible to the human eye. IR is generally (according to ISO, CIE) understood to include wavelengths from around to . IR is commonly divided between longer-wavelength

electromagnetic radiation of high frequency and high energy

thumb|A telecommunications tower with a variety of dish antennas for microwave relay links on [[Frazier Peak, Ventura County, California. The apertures of the dishes are covered by plastic sheets (radomes) to keep out moisture.]]

portion of the electromagnetic spectrum that is visible to the human eye

entire range and scope of frequencies of electromagnetic radiation

the 300–3000 GHz range of the electromagnetic spectrum

specialty of electronic engineering

Part of a spectrum

atmospheric window

range of wavelengths of the electromagnetic spectrum that can pass through the earth's atmosphere

energy carried by a single photon

region of the infrared electromagnetic spectrum used in astronomy (centered on 2.19 μm)

quiet band of the electromagnetic spectrum

atmospheric window

straying of waves in the radio and electromagnetic spectrums outside their allocations that cause problems for some activities, of particular concern to radio astronomers

Part of the electromagnetic spectrum

region of the infrared electromagnetic spectrum used in astronomy (centered on 1.63 μm)