Question

The major contribution of Sir CV Raman is:
A. Principle of buoyancy
B. scattering of light by molecule of a medium
C. electromagnetic theory
D. explanation of photoelectric effect

Answer 1

Hint: Raman Effect or Raman scattering is named after the Indian scientist Sir CV Raman. Raman scattering, is a special case of Rayleigh scattering. It is used in physics and chemistry to study the nature of the molecules. The shift in energy of the molecule is studied, to understand the nature of the molecules.

Complete answer:
Raman Effect or Raman scattering is named after the Indian scientist Sir CV Raman, is the study of inelastic scattering by the light molecules by a medium. He explained that there is an exchange in energy and change in direction of the light due to vibration, when it is passed through a medium.
This is the principle behind Raman Spectroscopy, which is used in physics and chemistry to study the nature of the molecules. When a monochromatic light is incident on a molecule, the electrons, which are in the ground state of the molecules absorb this radiation, and get excited. Since molecules are highly unstable in their excited states, the emit radiations complementary to the absorbed radiation to reach their ground state. This shift in energy is studied, to understand the vibration of the molecules.

Thus the answer is B. scattering of light by molecule of a medium.

Additional Information:
Raman scattering, is a special case of Rayleigh scattering phenomenon, according to which when the frequency of light is comparable with respect to the particle size of a molecule, then it results in the occurrence of scattering. Also, the extent of scattering is inversely proportional to the fourth power of the incident wavelength.

Note:
Raman scattering, is a special case of Rayleigh scattering. Raman Effect, is the study of inelastic scattering by the light molecules by a medium. This is the principle behind Raman Spectroscopy, which is used in physics and chemistry to study the nature of the molecules.