Question

Why is red colour selected for danger signal lights?​

Answer 1

Explanation:

Danger signals are red in colour because the red colour is scattered the least by air, water or dust molecules.

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So, red light is used as a danger signal as it is able to travel the longest distance through the fog, rain, etc

Answer 2

Answer:

Danger signals are red in colour because the red colour is scattered the least by air, water or dust molecules. ... So, red light is used as a danger signal as it is able to travel the longest distance through the fog, rain, etc.