Question

Which of the following physical processes is responsible for the blue color of the sky?

• A. Absorption of solar radiation by air molecules
• B. Total internal reflection of solar radiations by clouds
• C. Scattering of solar radiation by air molecules and particles
• D. Dispersion of solar radiations by clouds

Hint:

Remember the different light phenomena: - \textbf{Blue Sky:} Rayleigh Scattering (by small air molecules). - \textbf{Red Sunset/Sunrise:} Also Rayleigh Scattering (blue light is scattered away, leaving red light to reach the observer). - \textbf{White Clouds:} Mie Scattering (by larger water droplets, scatters all colors equally). - \textbf{Rainbows:} Dispersion and Total Internal Reflection.

Answer 1

The Correct Option is C

Step 1: Concept Identification:
The query seeks the scientific basis for the sky's blue appearance on clear days.
Step 2: Scientific Elaboration:
The mechanism behind the sky's blue hue is Rayleigh scattering.
Sunlight comprises a spectrum of colors. As sunlight traverses Earth's atmosphere, it encounters minute gas molecules, predominantly nitrogen and oxygen.
These molecules disperse the sunlight. Rayleigh scattering is more pronounced for shorter light wavelengths (blue and violet) compared to longer ones (red and orange).
Consequently, blue light, being scattered more extensively than other colors, is perceived by our eyes from all parts of the sky, rendering it blue.
Step 3: Conclusive Statement:
The dispersion of solar radiation by atmospheric molecules and particles accounts for the sky's blue coloration.