Mnemonic devices are ways to remember long lists... such as ROYGBIV (Red Orange Yellow Green Blue Indigo Violet)
and the latest written by B4 Energy and Dynamics (RMIVUXG) Radio Micro Infrared Visible Light Ultraviolet X-ray and Gamma (recently my ipod vanished under xavier's G-string).
Don't forget wavelength and frequency are inversely proportionate.
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