Question

[b] why are the traffic lights signals of red colour?

[c] Name some suspended particles that present in the atmosphere. ​

Answer 1

Answer:

(a). In traffic signals red colour light is used to stop vehicles because it is having longer wave length. The colour which is having longer wavelength will undergo lesser scattering, hence it is visible from a longer distance. ... So red light is able to travel the longest distance through fog, rain, and the alike.

Answer 2

❣️ANSWER ❣️

(B) The main reason why the red colour is used to in the traffic signals to stop the vehicle is that red is scattered the least by the air molecules. ... Red has the highest wavelength of all the colours, and it is scattered the least. So, it can travel the longest distance and can penetrate through rain, mist and fog.

(c) Particulate matter is the sum of all solid and liquid particles suspended in air, many of which are hazardous. This complex mixture contains for instance dust, pollen, soot, smoke, and liquid droplets. More... 1.1 These particles come in many different size ranges such as coarse, fine and ultrafine.