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Wavelength is the distance between one wave crest to the next. Commonly, in the electromagnetic wave spectrum, we think of radio waves as having the longest wavelength, but the longest electromagnetic (EM) waves are ultra low frequency (ULF) waves. These waves are sometimes, but not routinely, associated with radio wave lengths, although they are at the same end of the spectrum. There is some consensus that the longest ULF wave is in the approximate range of 106 to 1011m. However, waves with lengths approaching infinity have not been ruled out.

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13y ago

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