Science Day

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  • Topic: C. V. Raman, Raman scattering, Nobel Prize
  • Pages : 7 (2035 words )
  • Download(s) : 2417
  • Published : August 3, 2011
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National Science Day
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Introduction
History
Time to celebrate
Introduction:

Rashtriya Vigyan Evam Prodoyogiki Sanchar Parishad (RVPSP) (National Council for Science & Technology Communication) of the Ministry of Science and Technology celebrates National Science day (NSD) to popularise the benefits of scientific knowledge and pratical appropriation.

Various activities are organized on the day like debates, quiz competitions, exhibitions, lectures, etc., in which college students, school students and teachers too participate.

Every year a different theme is selected and all the forth programmes and activities are based around that theme.

The day is celebrated to honour Nobel laureate Sir C.V. Raman for his invention of the ‘Raman effect’ on 28th February 1928.

Whole nation takes the honour of thanking all the scientists for their remarkable contributions and dedication on this occasion.

The day attracts many young minds and motivates to take up science as their career.

The celebrations of this day include showcasing the country’s competence in the field of science.

Science has played very important role in transforming society. The events on this day reminds the importance of science; thus inspire people of all ages to work in the field of science, engineering and technology.

Sir C. V. Raman was honoured with the first prestigious Nobel Award in Physics for the country in 1930. Hence the National Science Day holds great significance for Indian Science and scientific community.

National Science Day brings an opportunity to focus on issues related to science centre stage. The activities organized on the occasion bring public face to face with the issues of great concern. People interact with the science fraternity for mutual benefit.

National Science Day is observed to spread the message of importance of science and its application among the people and to accelerate the pace of development. Science has contributed a lot towards welfare of humanity.

Raman Effect

Raman effect or Raman scattering as it is popular known as is an inelastic scattering of a photon.

When light is scattered from an atom or molecule, most photons are elastically scattered with almost the same energy (frequency) and wavelength as the incident photons. But a small fraction of the photons is scattered by excitation. The frequency of scattered photons is lower than the frequency of the incident photons. Feb 28th is our National Science day ! This day, in the year 1928, C.V. Raman announced to the world his famous discovery, a discovery which would earn him a Nobel prize. You can read about his work in the presentation speech that preceded his nobel lecture. Some excerpts: The diffusion of light is an optical phenomenon, which has been known for a long time. A ray of light is not perceptible unless it strikes the eye directly. If, however, a bundle of rays of light traverses a medium in which extremely fine dust is present, the ray of light will scatter to the sides and the path of the ray through the medium will be discernible from the side. We can represent the course of events in this way; the small particles of dust begin to oscillate owing to electric influence from the ray of light, and they form centres from which light is disseminated in all directions. The wavelength, or the number of oscillations per second, in the light thus diffused is here the same as in the original ray of light. But this effect has different degrees of strength for light with different wavelengths. It is stronger for the short wavelengths than for the long ones, and consequently it is stronger for the blue part of the spectrum than for the red part. Hence if a ray of light containing all the colours of the spectrum passes through a medium, the yellow and the red rays will pass through the medium without appreciable scattering, whereas the blue rays will be scattered to the sides. This effect has received the name...
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