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Why are danger signals red in colour ?

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Why are danger signals red in colour ?
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.
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Correct Answer - B
The danger signals are red because among all other colours, red colour is scattered the least by smoke or fog. This is primarily because wavelength of red colour is the largest.
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Why are danger signals red in colour ?
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