An astronaut in a spaceship sees the outer space as

If the scattering intensity of a liquid is $8 \text{ units}$ at a wavelength of $500 \text{ nm}$, then the scattering intensity at a wavelength of $400 \text{ nm}$ will be approximately: (in $\text{ units}$)

Why does the Sun have an elliptical shape at the time of sunrise and sunset? It is due to:

Sir $C.V.$ Raman was awarded the Nobel Prize for his work connected with which of the following phenomena of radiation?

The Sun is visible before actual sunrise and after actual sunset for some time. Explain this phenomenon.

Sir $C$.$V$. Raman was awarded the Nobel Prize in Physics for his work on: