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UPSC 2003: Diffusion of light in the atmosphere takes place due to
(a)Carbon dioxide
(b)Dust particles
(c)Helium
(d)Water vapours
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Not attemptedCorrect Answer: (b) Dust particles
Sunlight is scattered (diffused) in the atmosphere mainly by the tiny dust and aerosol particles suspended in air (Tyndall/Rayleigh scattering). Gases like CO₂ or He and water vapour play only minor roles in visible-light diffusion. ([britannica.com](https://www.britannica.com/science/Tyndall-effect?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2003 Science & Technology question?▼
The correct answer is option (b): Dust particles. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2003, GS Paper 1, as Question 31. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.