Question

Rising and setting sun appears to be reddish because:

• A. The sun is colder at sunrise or at sunset
• B. Diffraction sends red rays to the earth at these times
• C. Refraction is responsible for it
• D. Scattering due to dust particles and air molecules is responsible for it

Answer 1

The correct option is D Scattering due to dust particles and air molecules is responsible for it

According to Rayleigh's law of scattering, amount of scattering $\alpha \frac{1}{{\lambda }^4}$.
Red having maximum wavelength straight to the observer.
Most of the scattered light goes towards the sky, so the sky appears blue.