Why is red used as the stopping light at traffic signals?
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Due to the frequency of red light and the scattering properties of red light, it is apt for making traffic signs
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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 reason behind the scattering can be explained by Rayleigh scattering. The effect of scattering is inversely related to the fourth power of the wavelength of a color.
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