PREVIOUSLY ASKED IN:
PSC Miscellaneous Prelims 2018
Answer
Raman Effect
Explanation
Eminent Indian physicist Sir Chandrasekhara Venkata Raman (C. V. Raman) discovered the inelastic scattering of light, which is now famously known as the 'Raman Effect'. He made this discovery on February 28, 1928. When light traverses a transparent material, some of the deflected light changes in wavelength and amplitude. For this groundbreaking discovery, he was awarded the Nobel Prize in Physics in 1930.
Key Points
- > C.V. Raman discovered the 'Raman Effect' on February 28, 1928.
- > To commemorate this discovery, February 28 is celebrated as 'National Science Day' in India.
- > He received the Nobel Prize in Physics in 1930 (the first Asian to get a Nobel in science).
- > He was awarded the Bharat Ratna, India's highest civilian award, in 1954.
- > The discovery deals with the phenomenon of the 'Scattering of Light'.
- > Among the options, the invention related to 'Life of tree' (Crescograph) was made by J.C. Bose.
- > X-rays were discovered by Wilhelm Röntgen in 1895.
Additional Information
Important Discoveries by Indian Scientists
| Scientist | Discovery/Theory | Field |
|---|---|---|
| C.V. Raman | Raman Effect (Scattering of Light) | Physics |
| J.C. Bose | Crescograph (Plant stimuli response) | Botany/Physics |
| S.N. Bose | Bose-Einstein Statistics | Quantum Physics |
| Meghnad Saha | Thermal Ionization Equation | Astrophysics |
| Homi J. Bhabha | Cascade Process of Cosmic rays | Nuclear Physics |
Memory Tips
- National Science Day: February 28 is celebrated as National Science Day in India strictly to mark the discovery of the Raman Effect, not Raman's birthday.