Question

Why danger sign are made red in colour .
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Answer 1

because the wavelength of red colour is the highest and hence it can travel longer distances. therefore, people at a distance v.far from the danger signals can also see and get aware .

Always remember, if the wavelength is more then it will travel more distance and if it is less it will travel lesser distances

therefore speed of light is directly proportional to wavelength.

Answer 2

Here is your answer

The primary reason why the color red is used for danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color. ... These reasons make danger signals the most effective when they are painted in red.

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