Red light is used as traffic signal for stopping vehicles.Why?
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The primary reason why the color red is used for danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color. So red light is able to travel the longest distance through fog, rain, and the alike.
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The main reason why the red colour is used to in the traffic signals to stop the vehicle is that red is scattered the least by the air molecules.
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