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| light waves or particles, the band of colors produced when sunlight passes through a prism, comprising red, orange, yellow, green, blue, indigo, and violet |
| a sequence of changing states that produces a final state identical to the original one; one of a succession of periodically recurring events |
| phase speed or phase velocity | |
| —n | |
| physics wave speed, Also called: wave velocity the speed at which the phase of a wave is propagated, the product of the frequency times the wavelength. This is the quantity that is determined by methods using interference. In a dispersive medium it differs from the group speed | |
| phase velocity or phase velocity | |
| —n | |