Question

why use red colour in danger ​

Answer 1

Among the colours of visible light, red has more wavelength and least scattered. Thus, red colour can easily go through fog or mist or smoke without getting scattered. It can be seen from long distance. So, red colour is used in universal danger signal.

Answer 2

Answer:

due to sacttring of light

Explanation:

red light scatter more than other colour and it reaches are eye to see the light

so it is use as danger sign to stop any acident or use in car light to slow down the speed