Chandrasekhara Venkata Raman

 

Many people know Chandrasekhara Venkata Raman (more popularly known as C.V. Raman) because he was the first Indian Nobel Laureate in science. Till date Raman remains the only Indian to receive a Nobel Prize in science. There are two Indian-born scientists viz., Har Gobind Khorana and Subrahmanyan Chandrasekhar (who became US citizens) got Nobel Prizes in science.
Raman was also the first Asian to get Nobel Prize in science. Raman's celebrated discovery, the Raman Effect, experimentally demonstrated that the light-quanta and molecules do exchange energy which manifests itself as a change in the colour of the scattered light. However, this phenomenon was earlier predicted theoretically by Hendrik Anthony Kramers (1894-1952) and Werner Heisenberg (1901-76). It was the most convincing proof of quantum theory of light. This does not diminishes the importantce of Raman's discovery. As Albert Einstein (1879-1955) wrote : "C.V. Raman was the first to recognize and demonstrate that the energy of photon can undergo partial transformation within matter. I still recall vividly the deep impression that this discovery made on all of us." 

Chandrasekhara Venkata Raman was born at Tiruchirapalli in Tamil Nadu on 7 November 1888. His father was a lecturer in mathematics and physics so from the very beginning he was immersed in an academic atmosphere. Raman’s academic brilliance was established at a very young age. He finished his secondary school education at the tender age of thirteen and entered the Mrs. A.V.N. College at Vishakapatnam, Andhra Pradesh. Two years later he moved to the prestigious Presidency College in Chennai.

When he was fifteen, he topped his class to receive his B.A. degree with honours in Physics and English. Raman continued his studies at the Presidency College and when he was barely eighteen, graduated at the top of his class and received his M.A. degree with honours.

Raman joined the Indian Audit and Accounts Service and was appointed the Assistant Accountant General in the Finance Department in Kolkata. In Kolkata, he sustained his interest in science by working in the laboratory of the Indian Association for the Cultivation of Science, in his spare time studying the physics of stringed instruments and Indian drums.

In 1917, Raman gave up his government job to become the Sir Taraknath Palit Professor of Physics at the Science College of University of Calcutta (1917-33). He made enormous contributions to research in the areas of vibration, sound, musical instruments, ultrasonics, diffraction, photoelectricity, colloidal particles, X-ray diffraction, magnetron, dielectrics, etc. In particular, his work on the scattering of light during this period brought him world-wide recognition. 


Raman deserves to be remembered not only for his towering scientific accomplishment but also for his indomitable will. Raman was a staunch patriot and he had great faith in India's potential for progress. He excelled under the most adverse circumstances. Raman was a great populariser of science. "He was perhaps the greatest salesman science has ever had in this country", says S. Ramaseshan, a pioneer of X-ray crystallography in India and a nephew of Raman. During his popular science lectures (or `performances' as Raman called them) Raman held his audience spellbound. His lectures were always accompanied by lively demonstrations. Raman had a deep sense of humour. According to Ramaseshan, the popular science lectures of Raman were so gripping because, "He talked only of those things about which he felt intensely or those things which he understood well or wanted to understand better. He brought out things in their simplest and their most basic elements. He made his audiences feel that they had seen it all too." Raman was a lecturer par excellence. Even his critics had to agree on this point. Throughout his life Raman lectured. He lectured to diverse audiences. However, he was at his best when he delivered popular science lectures. Raman also gave radio talks. The texts of his nineteen radio talks were brought out in a book form. The book was titled The New Physics: Talks on Aspects of Sciences and it was published by the Philosophical Library of New York. The topics covered by Raman ranged from the microscopic world of atoms to the universe itself. The quality of Raman's lectures can be guessed from what Francis Low, a distinguished theoretical physicist then working at the Institute for Advanced Studies, Princeton, wrote in the introduction to this book : "Physics by its very nature requires extreme specialization on the part of its students. Its conclusions, which must eventually predict numbers for the results of actual measurements, are best expressed in mathematical formulae. This has the disadvantage of making the subject well-nigh unintelligible to the layman. There are unfortunately few teachers who are able to surmount this handicap. Professor Raman has written a book which avoids this pitfall and thus should give the lay reader an opportunity of penetrating at least part of the way into the mysteries of this interesting and important science". 

In 1917, he was offered the professor of Physics at the Calcutta University, and he decided to accept this opportunity. After 15 years service at the Calcutta University, he left that job and shifted to Bangalore and became the Director of the Indian Institute of Science, where two years later he continued as a professor of physics. In 1947, the new Government of Independent India appointed him as the first National Professor. He also worked in the field of magnetic attraction and theory of musical instruments. He worked out the theory of transverse vibration of bowed strings, because of superposition velocities. This does a better job in explaining bowed string vibration over Helmholtzs approach.

Professor C V Raman was also the first to investigate the harmonic nature of the sound of the Indian drums such as the tabla and the mridanga. In 1930, for the first time in its history, an Indian scholar, educated entirely in India has received highest honour in science, the ‘Nobel Prize’ in physics. In 1943, he founded ‘Raman Research Institute’, near Bangalore. His discovery of the ‘Raman Effect’ made a very distinctive contribution to Physics. He was also conferred the hishest title of ‘Bharat Ratna’ in 1954. The ‘Raman Effect’ was a demonstration of the ‘Collision’ effect of light bullets (Photons) passing through a transparent medium, whether solid, liquid or gaseous. Raman was also awarded the ‘Lenin Peace Prize’ in 1957. India celebrates National Science day on 28th February every year to commemorate Raman’s discovery.

He retired from the Indian Institute in 1948 and after one year, he established the Raman Research Institute in Bangalore, served as its director and remained active there until his death, at the age of eighty-two. Sir Venkata Raman died on Nevember 21, 1970 at Bangalore, India. We should proud on him.