Question

3Why danger signs are made of red colour ?

Answer 1

Answer:

Danger signals are red in colour because the red colour is scattered the least by air, water or dust molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a given colour. Since the colour red has the highest wavelength of all the colours it gets scattered the least. So, red light is used as a danger signal as it is able to travel the longest distance through the fog, rain, etc. without being scattered or faded away.