Question

Red lights are used for danger signals .Why?

Answer 1

Hey user,
Nice question....Your answer is:-

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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.

Answer 2

Red colour is a warm colour which is that of in forest fires. It creates a "danger" felling in not only human but animal minds as well. Hence it is so.