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Question
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 ____________.
Options
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
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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.
Explanation:
Red colour has a longer wavelength so least scattered by smoke or fog.
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