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Q.

The danger signals installed on the tops of tall buildings are red because, of all colours, red is the least [[1]] by smoke or fog.


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Detailed Solution

The danger signals installed on the tops of tall buildings are red because, of all colours, red is the least scattered by smoke or fog.
The amount of scattering is inversely proportional to the wavelength. Because red has the longest wavelength, the amount of scattering is minimum. Danger signals installed on tall buildings or traffic signals are red so that they can be seen from afar.
 
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