Model Question and Answers for APSC | When is the National Science day celebrated and Why? (APSC-2015)
Ans : 28th February is celebrated as National Science Day in India. On this day in 1928, Indian scientist CV RAMAN discovered a phenomenon of scattering of photons which was later known as ‘Raman Effect’ after his name. After two years in 1930, he got the Nobel Prize for this remarkable discovery and this was the first Nobel Prize for India in the field of Science. To mark the discovery of his famous phenomenon, National Science Day is celebrated in India on the day each year.
Raman Effect is a phenomenon in spectroscopy discovered by the eminent physicist while working in the laboratory of the Indian Association for the Cultivation of Science, Kolkata. Raman Effect, change in the wavelength of light that occurs when a light beam is deflected by molecules. When a beam of light traverses a dust-free, transparent sample of a chemical compound, a small fraction of the light emerges in directions other than that of the incident (incoming) beam. Most of this scattered light is of unchanged wavelength. A small part, however, has wavelengths different from that of the incident light; its presence is a result of the Raman Effect