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 Definition For a repeating phenomenon such as a radio signal with a given frequency, the wavelength is the length, in meters, of a single repetition [d] [e]
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A not unrelated subject, more engineering than physics

Perhaps someone would like to collaborate on antenna, and possibly transmission line (i.e., as a function of wavelength) and even waveguide. For whatever reason, I've found it very hard to get a good start on such articles.

I also want to get started on fiber optics, the hardest part of which was deciding if it should be optical fiber. Bless redirects. I understand these things from a practical and sometimes quite nuanced basis, but I've had writer's block on them. Howard C. Berkowitz 14:58, 10 August 2009 (UTC)

It seems to me that not any periodic phenomenon has a wavelength. For instance, take a 78 rpm gramophone record, its frequency is 78/60 = 1.3 Hz, but what is its wavelength? --Paul Wormer 08:03, 8 March 2010 (UTC)
In that particular case, I'm inclined to say the wavelength is the circumference at the point it's playing, decreasing as it goes. But you're right more generally. A light can flash on and off regularly, for example. Peter Jackson 10:59, 8 March 2010 (UTC)