Multiple choice

Diffusion of light in the atmosphere takes place due to

  1. carbon dioxide

  2. dust particles

  3. helium

  4. water vapours

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diffusion (scattering) of light in the atmosphere occurs primarily due to dust particles and aerosols, which is why the sky appears blue (Rayleigh scattering) and sunsets appear red. Water vapor and CO2 do not significantly scatter visible light.