Why is red colour used as the stopping light at traffic signals?

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Minimum wavelength and less scatter

Maximum wavelength and less scatter

Less wavelength and less scatter

Maximum wavelength and more scatter

answer is C.

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Detailed Solution

The atmospheric particles scatter the light which travels through them. This reduces the visibility of the signal.
So, the colour which is least scattered by the atmospheric particles is selected.
Red colour has the longest wavelength among the seven colours of white light and therefore it is not scattered easily.

Therefore, stopping light at traffic signals has a red colour as it has a maximum wavelength and least scatter.

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