Blue colour of sea water is due to

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

Let $S_1$ be the amount of Rayleigh scattered light of wavelength $\lambda_1$ and $S_2$ that of light of wavelength $\lambda_2$ from a particle of size $a$. Which of the following statements is true?

To an observer on the earth,the stars appear to twinkle. This can be ascribed to

Which of the following processes play a part in the formation of a rainbow?
$(i)$ Refraction
$(ii)$ Total internal reflection
$(iii)$ Dispersion
$(iv)$ Interference

To an astronaut in a spaceship,the sky appears