Question

why dangers signals are red in colour​

Answer 1

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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. ... So red light is able to travel the longest distance through fog, rain, and the alike

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Answer 2

Answer:

because the red have a long wavelength ,so it is less scatter by air particles. hence, danger. signals are generally of red colour