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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 _______________?

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is scattered the most by smoke or fog

is scattered the least by smoke or fog

is absorbed the most by smoke or fog

moves fastest in air

answer is B.

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Detailed Solution

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 least by smoke or fog.
Scattering of light is a phenomenon of absorption and reemission of light of a particular wavelength in some other direction when it comes in contact with minute particles, size of which is comparable to the wavelength of that light.
“The wavelength of red colour is the largest”. So, it cannot be quickly scattered by the molecules of smoke or fog present in the air. Due to this reason, it can be easily seen from a considerable distance.

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