Name one of the seven main regions of the electromagnetic spectrum.
Use the broad regions in NASA's spectrum guide. Microwaves are listed separately from radio waves here; sub-bands and individual visible colors do not count as additional regions.
The seven broad regions are radio, microwave, infrared, visible, ultraviolet, X-ray and gamma-ray. This convention lists microwave separately, even though microwaves can also be treated as a subset of radio.
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Points are editorial tiers. The source supports membership in the set, not how many people know an answer.
- Visible light 25 · Familiar
- Visible light is the region detected by human eyes.
Also accepted: Visible
- Radio waves 25 · Familiar
- Radio waves form the long-wavelength end of this broad classification.
Also accepted: Radio · Radio wave
- X-rays 50 · Less common
- X-rays are a high-energy region of the electromagnetic spectrum.
Also accepted: X ray · X rays · X-ray
- Microwaves 50 · Less common
- NASA's broad guide gives microwaves their own region.
Also accepted: Microwave
- Ultraviolet 75 · Uncommon
- Ultraviolet lies beyond the violet end of visible light.
Also accepted: UV · Ultraviolet waves · Ultraviolet light · Ultraviolet radiation
- Infrared 75 · Uncommon
- Infrared lies beyond the red end of visible light.
Also accepted: IR · Infrared waves · Infrared light · Infrared radiation
- Gamma rays 100 · Rare
- Gamma rays occupy the highest-energy region in the guide.
Also accepted: Gamma ray · Gamma · Gamma radiation
Checked exclusions
- Near-infrared: Near-infrared is a sub-band of infrared, not another one of the seven broad regions.
- Red: Red is a color within visible light, not a separate broad spectrum region.
Sources for this question
- The Electromagnetic Spectrum
The seven broad region entries; the separate near-infrared entry is a sub-band rather than an eighth main region.
NASA Science · Checked 2026-11-04
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