India is celebrating the discovery of Raman Effect today in the form of National Science Day observed on 28th February every year.
- Indian scientist Sir Chandrasekhara Venkata Raman or CV Raman discovered the Raman Effect on this day in 1928. For this discovery, he was awarded the Nobel Prize in 1930.
- We celebrate National Science Day to make people aware of the importance of science in our day to day life. The day also gives an opportunity to the scientific-minded citizens in the country to showcase their work in organized shows. Students showcase various science projects. National and state science institutions demonstrate their latest researches.
- The theme for National Science Day 2018 is "Science and Technology for a sustainable future."
What is Raman Effect?
- Raman Scattering or the Raman effect is the inelastic scattering of a photon by molecules which are excited to higher vibrational or rotational energy levels. It was discovered by C. V. Raman and K. S. Krishnan in liquids and independently by Grigory Landsberg and Leonid Mandelstam in crystals. The effect had been predicted theoretically by Adolf Smekal in 1923.
- When photons are scattered from an atom or molecule, most of them are elastically scattered (Rayleigh scattering), such that the scattered photons have the same energy (frequency and wavelength) as the incident photons. A small fraction of the scattered photons are scattered inelastically by an excitation, with the scattered photons having a frequency and energy different from, and usually lower than, those of the incident photons.In a gas, Raman scattering can occur with a change in energy of a molecule due to a transition to another (usually higher) energy level. Chemists are primarily concerned with this "transitional" Raman effect.
Expected Questions
In India, National Science Day is Observed on
a. 6 April
b. 28 February
c. 13 December
d. 6 August
National Science Day is observed to mark the discovery of
a. Madhava Series
b. AKS Primality Test
c. Crescograph
d. Raman's Effect
