The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light is

scattered the most by smoke or fog

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scattered the least by smoke or fog

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moving at a slower pace in the air

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moving at a faster pace in the air

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Solution

The correct option is B scattered the least by smoke or fog
As light passes through the atmosphere, it gets scattered by small air particles. Lights of smaller wavelength is scattered the most and light with larger wavelength is scattered the least. Red colour can travel long distances without scattering because it has a long wavelength.

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