The world moved in cycles of various frequencies, returning to the points it had passed before. (religion-online.org)
In communications the devices will make it easier to separate data carried on various frequencies on a combined stream of white light that passes through optical fibers. (scientificamerican.com)
«We looked not only at how much energy is lost but also at the different amounts by which various frequencies are delayed,» he explained. (sciencedaily.com)