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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 (a) is scattered the most by smoke or fog (b) is scattered the least by smoke or fog

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
(a) is scattered the most by smoke or fog
(b) is scattered the least by smoke or fog
(c) is absorbed the most by smoke or fog
(d) moves fastest in air

Answers (1)

Ans. (b)
Amount of scattering is inversely proportional to fourth power of wavelength.
Wavelength of red colour is the largest so red colour is scattered the least by smoke or fog.
Hence the danger signals installed at the top of tall buildings are red in colour.
Thus it can be easily seen from a distance. This is the reason red is associated with danger and red is used as a stop signal as well.
Therefore option (b) is correct

 

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