Electromagnetic Waves
Electric (red) and magnetic (blue) waves propagate in phase sinusoidally, and perpendicularly to one another.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Electromagneticwave3D."
http://en.wikipedia.org/wiki/File:Electromagneticwave3D.gif
Wikipedia
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