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Are there any electromagnetic waves in a dark room?

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Yes. Visible light is only a part of the electromagnetic spectrum. For example heat is electromagnetic radiation of the infra-red end of the spectrum. And unless the temperature of the room is absolute zero, you can be certain there's heat, and hence,electromagnetic waves in there. read more

Yes. Visible light is only a part of the electromagnetic spectrum. For example heat is electromagnetic radiation of the infra-red end of the spectrum. And unless the temperature of the room is absolute zero, you can be certain there's heat, and hence,electromagnetic waves in there. read more

Dark matter doesn’t interact with EM radiation at all (or else it would not be dark, and we would call it gray matter). What exactly is dark matter is still unknown (we need direct experimental evidence). read more

First, there is the electromagnetic spectrum. You can make an electromagnetic wave of all different wavelengths - from larger than 1 meter (radio waves) to less than 10 picometers (gamma rays - but they are still waves). Here is the common classification of the electromagnetic spectrum going from large wavelengths to small. read more

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