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Does red light or blue light have a longer wavelength? how do you know?

User Aler
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Red has a longer wavelength than blue, The visible colors from shortest to longest wavelength are, violet, blue, green, yellow, orange, and red. Ultraviolet radiation has a shorter wavelength than the visible violet light. Infrared radiation has a longer wavelength than visible red light. The white light is a mixture of the colors of the visible spectrum.
User Jose Raul Barreras
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Blue light is earlier on the electro magnetic spectrum

User Hahn
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