national science day in india is celebrated on february 28th every year to commemorate the discovery of the raman effect by indian physicist sir chandrasekhara venkata raman also known as sir cv raman the discovery was announced on february 28th 1928 and raman won the nobel prize in physics in 1930 making him the first indian to receive a nobel prize in a scientific fieldwhat is cv raman effectthe raman effect is a phenomenon in which a photon interacts with a molecule causing it to undergo a change in energy and momentum specifically when a photon interacts with a molecule it can transfer some of its energy and momentum to the molecule causing it to vibrate or rotate this change in the molecules energy and momentum results in a shift in the wavelength of the scattered photon which is known as raman scatteringthe raman effect is used in raman spectroscopy which is a technique used to identify and analyze the chemical composition of materials in raman spectroscopy a laser is used to excite the molecules in a sample and the resulting raman scattering is measured and analyzed to determine the vibrational and rotational modes of the molecules in the samplehistory of national science daythe idea of celebrating national science day was first proposed by the national council for science and technology communication ncstc in 1986 and it was subsequently accepted by the indian government the first national science day was celebrated on february 28th 1987national science day objectivethe day is celebrated to recognize and appreciate the contributions of scientists and researchers to the field of science and to create awareness among the general public about the importance of science and its applications in everyday life it is an opportunity to promote scientific temper and encourage young people to take up careers in sciencewhy is national science day celebratednational science day is celebrated with various activities and events such as science exhibitions seminars workshops quizzes debates and lectures schools colleges universities research institutions and scientific organizations across india organize programs to mark the occasion each year a theme is chosen for national science day to highlight a particular area of scientific research or discovery the theme for national science day changes every year and it is decided by the department of science and technology government of india some of the themes of past national science days have included science and technology for sustainable future 2020 science and technology for indigenous development in india 2019 science and technology for a sustainable future 2018 and science and technology for specially abled persons 2017overall national science day is an important event that highlights the significance of science and encourages scientific curiosity and learning among people of all ages