UPSC Prelims 2003·GS1·geography·climatology

Diffusion of light in the atmosphere takes place due to

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  1. ACarbon dioxide
  2. BDust particlesCorrect
  3. CHelium
  4. DWater vapours

Explanation

The correct answer is B because the diffusion of light in the atmosphere is primarily caused by the scattering of sunlight. When sunlight enters the atmosphere, it strikes various suspended particles. Among the given options, dust particles are large enough to deflect and scatter light rays in different directions. This scattering process is what allows light to spread or diffuse, even into areas that are not in direct shadow. Gases like carbon dioxide and helium are molecules that are too small to cause this specific type of diffusion, and while water vapor contributes, solid dust particles are the most effective agents for the diffusion of light.
geography: Diffusion of light in the atmosphere takes place due to

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