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from the Artist: Unisex T-Shirt. Diagram of an AC sine wave and how it’s wavelength is measured. Also available on “Dark Shirts”:http://www.redbubble.com/people/destinysagent/t-shirts/7307391-wavelength-light !http://ih3.redbubble.net/work.7307391.1.fig,baby_blue,mens,fbfbfb.wavelength-light-v3.jpg!