Sir Kariamanikkam Srinivasa Krishnan, FRS, (4 December 1898 – 14 June 1961) was an Indian

physicist A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate cau ...

. He was a co-discoverer of

Raman scattering Raman scattering or the Raman effect () is the inelastic scattering of photons by matter, meaning that there is both an exchange of energy and a change in the light's direction. Typically this effect involves vibrational energy being gained by ...

, for which his mentor

C. V. Raman Sir Chandrasekhara Venkata Raman (; 7 November 188821 November 1970) was an Indian physicist known for his work in the field of light scattering. Using a spectrograph that he developed, he and his student K. S. Krishnan discovered that when ...

was awarded the 1930

Nobel Prize in Physics ) , image = Nobel Prize.png , alt = A golden medallion with an embossed image of a bearded man facing left in profile. To the left of the man is the text "ALFR•" then "NOBEL", and on the right, the text (smaller) "NAT•" then " ...

Early life

Kariamanikkam Srinivasa Krishnan generally referred to as K. S. Krishnan or KSK, was born in a

Vaishnavite Vaishnavism ( sa, वैष्णवसम्प्रदायः, Vaiṣṇavasampradāyaḥ) is one of the major Hindu denominations along with Shaivism, Shaktism, and Smartism. It is also called Vishnuism since it considers Vishnu as th ...

brahmin Brahmin (; sa, ब्राह्मण, brāhmaṇa) is a varna as well as a caste within Hindu society. The Brahmins are designated as the priestly class as they serve as priests ( purohit, pandit, or pujari) and religious teachers ( ...

family on 4 December 1898 in

Watrap Watrap {{IPA-ta, ʋattiɾaːjiɾɯppɯ, lang) is a taluk in Virudhunagar District, in the Indian state of Tamil Nadu. History Watrap's traditional name before the British came was Vatratha Iruppu, which translates as "surplus water". Cult ...

Tamil Nadu Tamil Nadu (; , TN) is a state in southern India. It is the tenth largest Indian state by area and the sixth largest by population. Its capital and largest city is Chennai. Tamil Nadu is the home of the Tamil people, whose Tamil language ...

. His father was a farmer-scholar deeply versed in

Tamil Tamil may refer to: * Tamils, an ethnic group native to India and some other parts of Asia ** Sri Lankan Tamils, Tamil people native to Sri Lanka also called ilankai tamils **Tamil Malaysians, Tamil people native to Malaysia * Tamil language, na ...

literature. He had his early education in Hindu Higher Secondary school, in Watrap, after which he attended the American College in Madurai and the

Madras Christian College Madras Christian College (MCC) is a liberal arts and sciences college in Chennai, India. Founded in 1837, MCC is one of Asia's oldest extant colleges. The college is affiliated to the University of Madras but functions as an autonomous insti ...

. After gaining his degree in Physics he became a demonstrator in chemistry.

Early career

In 1920, Krishnan went to work with C.V. Raman at the Indian Association for the Cultivation of Science,

Kolkata Kolkata (, or , ; also known as Calcutta , the official name until 2001) is the capital of the Indian state of West Bengal, on the eastern bank of the Hooghly River west of the border with Bangladesh. It is the primary business, comme ...

(then Calcutta). There he engaged himself in experimental study of the scattering of light in a large number of liquids and its theoretical interpretations. He played a significant role in the discovery of the Raman scattering. In 1928 he moved to the

Dacca University Dhaka ( or ; bn, ঢাকা, Ḍhākā, ), formerly known as Dacca, is the capital and largest city of Bangladesh, as well as the world's largest Bengali-speaking city. It is the eighth largest and sixth most densely populated city i ...

(now in Bangladesh) as the Reader in the physics department where he studied magnetic properties of crystals in relation to their structure. Krishnan, along with other rising scientists such as Santilal Banerjee, B.C. Guha, and Asutosh Mukherjee developed an elegant and precise experimental technique to measure the magnetic anisotropy of diamagnetic and paramagnetic crystals. Their findings were published by the Royal Society of London in 1933 under the title, ''Investigations on Magne-Crystallic Action.'' In 1933 he returned to Kolkata to take up the post of Mahendralal Sircar Professor of Physics in the Indian Association for the Cultivation of Science where he continued to collaborate fruitfully with Banerjee to elaborate on the magnetic properties of crystals in relation to their structure. Their joint papers and communications (published in ''Nature, Terrestrial Magnetism and Atmospheric Electricity'', and by the Royal Society), remain to this day, aside from a number of other pathbreaking contributions they also published in various Physics journals, the most definitive scientific studies on the structure and tendencies of small crystals. Their experiments in Dacca and continued collaborative research in Kolkata led to what is now known as the

Krishnan Banerjee method Krishnan is a common name in South India. Krishnan refers to the Hindu deity Krishna. Krishnan is also combined with other names into a single name such as Ananthakrishnan, Balakrishnan, Gopalakrishnan, Jayakrishnan, Muralikrishnan, Ramakrishnan, ...

for measuring the magnetic susceptibility of small crystals. Krishnan was elected as Fellow of the Royal Society (FRS) in 1940. His Royal Society candidature certificate in 1935 read: "''Distinguished for his investigations in molecular optics and in magne-crystalline action:collaborated with Sir C.V. Raman in extensive theoretical and experimental studies on light scattering, molecular optics and in the discovery of the Raman Effect (1928). More recently has been publishing many valuable investigations (Phil Trans Royal Society and elsewhere) on the significance of magnetic anisotropy in relation to crystal architecture and thermo-magnetic behaviour at the lowest temperatures. Has published important work on pleochroism in crystals and its relation to photo-dissociation. Leader of an active school of research in Calcutta.''" In 1942, he moved to

Allahabad University , mottoeng = "As Many Branches So Many Trees" , established = , type = Public , chancellor = Ashish Chauhan , vice_chancellor = Sangita Srivastava , head_label ...

as Professor and Head of the Department of Physics where he took up the physics of solids, in particular of metals. He was knighted in the 1946 Birthday Honours List and awarded the

Padma Bhushan The Padma Bhushan is the third-highest civilian award in the Republic of India, preceded by the Bharat Ratna and the Padma Vibhushan and followed by the Padma Shri. Instituted on 2 January 1954, the award is given for "distinguished service ...

by the

Government of India The Government of India ( ISO: ; often abbreviated as GoI), known as the Union Government or Central Government but often simply as the Centre, is the national government of the Republic of India, a federal democracy located in South Asia, ...

in 1954. He was the first recipient of the prestigious Bhatnagar Award in 1958. On 4 January 1947 K. S. Krishnan was appointed first director of National Physical Laboratory

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area, the List of countries and dependencies by population, second-most populous ...

. This was one of the earliest national laboratories set up under the Council of Scientific and Industrial Research.

Quotes about Krishnan

* ''What is remarkable about Krishnan is not that he is a great scientist but something much more. He is a perfect citizen, a whole man with an integrated personality.'' – Jawaharlal Nehru

Collected works

The scientific papers of K. S. Krishnan have been published in 1988 by the National Physical Laboratory (located on Dr K.S. Krishnan Road, New Delhi 110012). The book of 950 pages has been made available in the Public Library of India collection of the Internet archive at https://archive.org/details/in.ernet.dli.2015.502306

References

External links