Question

why red signals are used as danger sign

Answer 1

The reason why the color red is used as danger signal is that red light is scattered the least by air molecules.the effect of scattering is inversely related to the fourth power of wavelength of a color

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

No wonder why it is so sharp color...

Hope this helps u..

And thanks for a chance to help...

Gud luck..

Answer 2

Longer the wavelength, lesser will be the scattering of light. Now, among the colors of visible light, red has the longest wavelength. Hence, it is least scattered by the atmospheric particles. As a result, whether it is fog or smoke, red light passes comparatively easily through them