Red coloured light is used in traffic signals to indicate the vehicles to stop because compared to other color red light is
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The primary reason why the color redis 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 acolor.
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Explanation:
In traffic signals red colour light is used to stop vehicles because it is having longer wave length. The colour which is having longer wavelength will undergo lesser scattering, hence it is visible from a longer distance.
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