Albert Einstein contributed more than any other scientist to the modern vision of physical reality. His theory of relativity is held as human thought of the highest quality.
Albert Einstein was born in 14 March 1879 in Ulm, Baden-Württemberg, Germany. His father, Hermann, ran an electrical technology business, giving Albert an early introduction to the power of science. But the business often teetered on the brink of failure. Soon afterwards the family moved to Munich, a bustling city where his father hoped to find a better environment for his shaky business. His mother, Pauline, forced him to take violin lessons. At first he objected vehemently, but in time he came to love the music with a passion. On the School class photograph in Munich, 1889, Albert is in the front row, second from right. He did well only in mathematics and in Latin (whose logic he admired). In 1894 Einstein's family moved to Milan and Einstein decided officially to relinquish his German citizenship in favour of Swiss. In 1895 Einstein failed an examination that would have allowed him to study for a diploma as an electrical engineer at Zurich. After attending secondary school at Aarau Einstein returned (1896) to the Zurich Polytechnic, graduating (1900) as a secondary school teacher of mathematics and physics. Marcel Grossman, whom Einstein met in Zurich, quickly recognized his friend's genius. He did all he could to promote Einstein's career. A photograph taken at this time shows Marcel Grossman, Einstein, Gustav Geissler, and Eugen Grossman.
He worked at the patent office in Bern from 1902 to 1909 and while there he completed an astonishing range of theoretical physics publications, written in his spare time without the benefit of close contact with scientific literature or colleagues. Einstein obtained his doctorate from the University of Zurich in 1905. In 1908 he became a lecturer at the University of Bern, the following year becoming professor of physics at the University of Zurich.
By 1909 Einstein was recognised as a leading scientific thinker. After holding chairs in Prague and Zurich he advanced (1914) to a prestigious post at the Kaiser-Wilhelm Gesellschaft in Berlin. From this time he never taught a university courses. Einstein remained on the staff at Berlin until 1933, from which time until his death he held a research position at the Institute for Advanced Study in Princeton.
In the first of three papers (1905) Einstein examined the phenomenon discovered by Max Planck, according to which electromagnetic energy seemed to be emitted from radiating objects in discrete quantities. The energy of these quanta was directly proportional to the frequency of the radiation. This seemed at odds with the classical electromagnetic theory, based on Maxwell's equations and the laws of thermodynamics which assumed that electromagnetic energy consisted of waves which could contain any small amount of energy. Einstein used Planck's quantum hypothesis to describe the electromagnetic radiation of light.
Einstein's second 1905 paper proposed what is today called the special theory of relativity. He based his new theory on a reinterpretation of the classical principle of relativity, namely that the laws of physics had to have the same form in any frame of reference. As a second fundamental hypothesis, Einstein assumed that the speed of light remained constant in all frames of reference, as required by Maxwell's theory.
Later in 1905 Einstein showed how mass and energy were equivalent. Einstein was not the first to propose all the components of special theory of relativity. His contribution is unifying important parts of classical mechanics and Maxwell's electrodynamics.
The third of Einstein's papers of 1905 concerned statistical mechanics, a field of that had been studied by Ludwig Boltzmann and Josiah Gibbs.
After 1905 Einstein continued working in the areas described above. He made important contributions to quantum theory, but he sought to extend the special theory of relativity to phenomena involving acceleration. The key appeared in 1907 with the principle of equivalence, in which gravitational acceleration was held to be indistinguishable from acceleration caused by mechanical forces. Gravitational mass was therefore identical with inertial mass.
By 1911 Einstein was able to make preliminary predictions about how a ray of light from a distant star, passing near the Sun, would appear to be bent slightly, in the direction of the Sun.
About 1912, Einstein began a new phase of his gravitational research, with the help of his mathematician friend Marcel Grossmann, by expressing his work in terms of the tensor calculus of Tullio Levi-Civita and Gregorio Ricci-Curbastro. Einstein called his new work the general theory of relativity. After a number of false starts he published, late in 1915, the definitive version of general theory.
When British eclipse expeditions in 1919 confirmed his predictions, Einstein was idolised by the popular press. Einstein returned to Germany in 1914 but did not reapply for German citizenship.
Einstein received the Nobel Prize in 1921 but not for relativity rather for his 1905 work on the photoelectric effect.
This letter from Albert Einstein to President Franklin D. Roosevelt from August 2, 1939 led to the Manhattan Engineering District, also known as the Manhattan Project, a national crash program racing to develop atomic weapons before Nazi Germany. The Manhattan Project was the seed that grew into the modern national laboratory system, which today includes many non-weapons-research laboratories, such as Argonne.Quotes:
Einstein's wits and his ability to bring things to the point make him an abundant source of quotes. A collection of his famous quotes can be found here.Pictures:
A collection of thumbnail images to give an overview about existing pictures of Albert Einstein.References:
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