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What does electromagnetic spectrum mean?

Looking for the meaning or definition of the word electromagnetic spectrum? Here's what it means.

Noun
  1. (physics) The entire range of wavelengths of all known electromagnetic radiations extending from gamma rays through visible light, infrared, and radio waves, to X-rays.
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Unfortunately, Earth's atmosphere blocks almost all wavelengths in the electromagnetic spectrum.
Each color in this image represents a different region of the electromagnetic spectrum, from X-rays to infrared light.
It isn't hot enough to radiate UV rays but it does radiate in the visible and infrared parts of the electromagnetic spectrum.
The electromagnetic spectrum is not visible to the human eye and yet we inhabit a world that is surfeit with spectrum.
It's really a technical way of showing the entire electromagnetic spectrum.
Terahertz light is a little-studied realm of the electromagnetic spectrum between microwave and infrared light.

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