Question

Dangerous signals light red give reason

Answer 1

Among the colours of visible light, red has more wavelength and least scattered. Thus, red colour can easily go through fog or mist or smoke without getting scattered. It can be seen from long distance. So, red colour is used in universal danger signal.

Answer 2

the colour red is the brightest colour of all.
when there is danger ahead , people often put red symbols to aware the person.
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