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Wednesday, February 11, 2009

SIR C V RAMAN

SIR C V RAMAN
( 1888 - 1970 )
C.V.Raman is the first Nobel Scientist of India. He won Nobel Prize in 1930 in physics for his discovery “Raman Effect”.

Chandrashekara Venkata Raman was born on November 7, 1888 at Tiruchinapalli. He was the son of college teacher. He did his M.A. at Presidency college in Chennai. He took up an administrative job in the Finance Ministry in Kolkatta. His interest in science made him to become a member of the Indian Institute for cultivation of science.

He studied acoustics. He went to London on a lecture tour. On his return journey he was fascinated by the blueness of the sky and sea. He questioned himself why were they blue. He found and concluded that the blueness was due to the scattering of light by water molecules. He wished to prove his theory. He did research in optics. In 1924 he was elected FRS. London for his contribution to optics.

He discovered the scattering of light and later it was named Raman effect. This was discovered on 28 February 1928. He was awarded Nobel Prize. In 1943 he founded his own institute in Bangalore, the Raman Research Institute. He continued his research till his death on November 20, 1970. He worked earlier in Indian Institute of Science, Bangalore.

The Raman effect is important in understanding the molecular structure of chemical compounds. It is the Phenomenon that causes changes in nature of light when it is passed through a transparent medium whether solid, liquid or gaseous.

February 28, annually is being celebrated as National Science day in India.

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ALESSANDRO VOLTA



ALESSANDRO
VOLTA
(1745-1827)

The Italian physicist Alessandro Volta (1745-1827) introduced something new. He found, in 1800, that two metals (separated by solutions capable of conducting an electric charge) could be so arranged that new charge was created as fast as the old charge was carried off along a conducting wire. He had invented the first electric battery and produced an electric current.
Italian physicist; physics professor; experimented with electrical forces; invented first practical battery using cells made from two kinds of metals; this verified his theory of differing electrical potentials for unlike metals; electric potential difference is known as voltage and its unit is the Volt (V).

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LUDWIG BOLTZMAN



LUDWIG BOLTZMAN
( 1844 - 1906 )

The Austrian physicist Ludwig Boltzmann (1844-1906) had analyzed the behavior of gases on the assumption that they were an assemblage of a vast number of randomly moving particles (the kinetic theory of gases). They were able to derive Boyle's law on this basis, provided they made two further assumptions;
that there were no attractive forces between gas molecules.
that the gas molecules were of zero size.
Gases that fulfill these assumptions are perfect gases.
Neither assumption is quite correct. There are small attractions between gas molecules, and though these molecules are exceedingly small, their size is not zero. No actual gas is quite "perfect", therefore, although hydrogen and the later-discovered helium come close.

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MADAM CURIE

MADAM CURIE
( 1867 - 1934 )

A lady scientist Marie Curie who discovered Radium was born at Warsaw in Poland. Her name was Marie-Sklodowska. She married Pierre Curie who was also a scientist and became famous as Madam Curie.

Madam Curie was fortunate. Both her parents were teachers. Her childhood was spent in studies and at 16. She came out of highschool with a gold medal. In 1891 she went to Paris and obtained science degree from Sakhan university. There she fell in love with Pierre and they got married.

Madam curie started her carrer in science with Prof.Henri Becquerel, the discoverer of radio activity. Both husband and wife did research. Their mutual interest was in magnetism. After Becquerel discovered that Uranium salts emitted rays that resembled X-rays, the Curies set out to discover whether there were other substances that emitted such rays. They finally managed to isolate the radium metal in 1910. to do this research the Curie couple requested the government of Bohomia to donate 10,000 kgs. Of uranium pitchblende free of cost. It was found in plenty there. They gotit free of cost. For months together the couple did a lot of hard work to extract radium from it. For this work Marie Curie, Pierre Curie and Becquerel received the Nobel prizefor physics in 1903.

In 1911 Madam Curie wa awarded the Nobel prize in chemistry for her work on the isolation of radium and polonium and for the study of the chemical properties of these elements.

Soon after the discovery, radium was found effective in the treatment of cancer. The Curies had a daughter and she was Irene curie who married Fredric Juliot. Both Irene and Juliot were scientist and they were awended Nobel Prize in 1935 for chemistry. They synthesized artificial radio active substances.

In 1906 Pierre died in a road accident. Marie Curie established Curie Insitute of Radium. An element ‘Curium’ is named after her and a unit of radio activity ‘Curie’ have been named in her honour.

Throughout her life Marie Curie was exposed to radio active substances. She died of leukemia and blood cancer on July 4, 1934.

The life of Marie and Pierre Curie shows how they were devoted to science. The entire Curie family worked for the benefit of mankind.

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JONS JAKOBS BERZELIUS



JONS JAKOBS
BERZELIUS
(1779-1848)

Swedish physician and chemist; discovered cerium, selenium, lithium, silicon, titanium and thorium; coined the terms "isomer" and "isomerism"; published a revised version of the periodic table with atom weights very close to today's table (1828); proposed system of elemental symbols and chemical notation.

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KANADA

KANADA
( 600 B.C.)

Vaisesika Sutras are a blend of science, philosophy and religion. These sutras or Aphorisms were propounded by the Indian scientist Kanada.

The essence of these Sutras is the atomic theory of matter.

Kanada said: “Everything is made up of ‘Paramanu’. When matter is divided, then further divided, till further no division is possible, the remaining indivisible entity is Paramanu. This does not exist in a free state nor can it be sensed through any human organ. It is indestructible.” Paramanu is atom. The name is given by Kanada.

Kanada, the scientist identified different or a variety of Paramanus. He said that each paramanu has a specific property which is same as the class of substance to which it belongs to. This peculiar property has made to be called vaisesika sutra.

He also discovered : If two paramanu belonging to one class of substance combined a devinuka is produced. This devinuka or binary molecule has the properties similar to those of the two original paramanu.

Paramanu or atom belonging to different classes of substance could also combine in large numbers., “because of the peculiarily or speciality of paramanu all things seen in the world are formed” he said.

Heat is the root cause for a change. When you heat a substance there will be a change. Due to heat mango ripens. Due to heat the earthen pot blackens. Due to heat water boils. So Kanada claimed that heat was responsible for any change.

Kanada was a saint. He was in a hermitage. National Aeronautical Laboratory in Bangalore runs a science magazine in Kanada’s name. The magazine is Kanada.

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JOSEPH LISTER

JOSEPH LISTER
( 1827 - 1912)

Lord Joseph Lister was a British surgeon. He received his medical degree from university college, London. He was professor of surgery at Edinburg and later at King’s college hospital.

Lister studied Louis Pasteur’s work on micro organisms in fermentation process and thought that minute germs also cause infections. He developed techniques of antisceptic surgery. He developed techniques of antisceptic surgery. He established the British Institute of preventive medicine in 1893. It was called Lister institute after his death in 1912.

Lister involved Carbolic acid dressings, cleansing instruments and ligatures in carbolic solutions. Carbolic acid or phenol is a disinfectant that prevent all the post operative problems of infection.

Lister was the first physician to be elevated to the House of Lords. The honour was bestowed upon him by Queen Victoria. She was a patient of Lister earlier.

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JOHN DALTON



JOHN DALTON
(1766-1844)

An English chemist, John Dalton (1766-1844), went through this chain of reasoning. In this, he was greatly aided by a discovery he made. Two elements, he found, might, after all, combine in more than one set of proportions, but in so doing they exhibited a wide variation of combining proportions and different compound was formed for each variation

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JOHN NAPIER

JOHN NAPIER
( 1550 - 1617 )

Today we are all living in computer age. Logarithms are not much in vogue. But at one time even in 20th century for difficult mathematical calculations logarithms were the base. The concept of Logarithms was introduced by the British mathematician John Napier.

Napier was born in 1550 at Merchiston castle near Edinburgh. He entered the university of St.Andrews at the age of 13. But he left it early without obtaining a degree. He returned to his native after he traveled abroad. He married in 1572 but his wife died in 1579. Again he married.

In 1593 he wrote a book on the Church of Rome. In the book he had boldly said that the Popes of Church would destroy the world between 1688 and 1700. The book saw twenty one editions of which ten editions were sold during his life time.

He invented Napier Rod an instrument used for addition, subtraction and calculating, square roots. In 1593 he started working on logarithms. He prepared tables of natural logarithms; that is, logarithms to base ‘e’. These were later modified by Henry Briggs by using the number 10 as the base.

Napier did research on trigonometry. He contributed to the development of spherical trigonometry.

Description of Marvelons Canon of Logarithms (1614) and construction of the Marvelons Canon of logarithms (1620) are the two treatises published by Napier. Logarithm tables help students a method for speedy calculation.

Napier died on 4 April 1617 in his native place.

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JAMES CHADURICK

JAMES CHADURICK
(1891 - 1974)

Chadurick was the discoverer of Neutron. He found that when Beryllium was exposed to bombardment by Alpha particles, it released an unknown radiation. He interpreted this radiation as being composed of particles of mass approximately equal to that of the PROTON but having no charge, he called neutrons. Chadurick was a British physicist. He won Nobel prize in physics for his discovery of the NEUTRON in 1935.

The study of neutrons led the discovery of Nuclear Fission and the first Nuclear reactor.

Neutron is an elementrary particle that is a part of the atoms of all elements except normal hydrogen. It is present in the nucleus of the atom along with other particle Proton.

Reactor is an assembly in which nuclear Fission can be carried out in a controlled manner.

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