red colour is used for danger signals because
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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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Red colour is used for signals since it's wavelength is largest hence a little deviation of colour causes it yo travel in a straight line hence the further person can also see the red light
Red colour is used for signals since it's wavelength is largest hence a little deviation of colour causes it yo travel in a straight line hence the further person can also see the red light
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