National Science Day 2015

National Science Day will be celebrated on February 28 th every year.

  • This year’s theme: Science for Nation Building. It has been chosen for the purpose of raising public appreciation on scientific issues for the development of nation.

About National Science Day:

  • National Science Day (NSD) is celebrated every year on 28th February to mark the discovery of the ‘Raman Effect’, for which a Nobel Prize winning research paper submitted by Sir C.V. Raman was accepted on that day.

What is Raman Effect?

  • Raman Effect is a phenomenon in spectroscopy discovered by the eminent physicist C.V. Raman.
  • 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.
  • Theme of National Science Day 2014: Fostering Scientific Temper and Energy conservation.

Sources: PIB,


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