Sir Nikolaus Bernhard Leon Pevsner was a German British scholar of the history of art of architecture. Pevsner is best known for his monumental 46-volume series of county-by-county guides, The Buildings of England simply referred to by his surname. Nikolaus Pevsner was born in Leipzig, the son of Hugo Pevsner, a Russian-Jewish fur merchant, his wife, Anna, he attended St. Thomas School and went on to study at several universities, Munich and Frankfurt am Main, before being awarded a doctorate by Leipzig in 1924 for a thesis on the Baroque architecture of Leipzig. In 1923, he married the daughter of distinguished Leipzig lawyer, Alfred Kurlbaum, he worked as an assistant keeper at the Dresden Gallery. He converted to Lutheranism early in life. During this period he became interested in establishing the supremacy of German modernist architecture after becoming aware of Le Corbusier's Pavillon de l'Esprit Nouveau at the Paris Exhibition of 1925. In 1928 he contributed the volume on Italian baroque painting to the Handbuch der Kunstwissenschaft, a multi-volume series providing an overview of the history of European art.
He taught at the University of Göttingen, offering a specialist course on English art and architecture. According to biographer Stephen Games, Pevsner welcomed many of the economic and cultural policies of the early Hitler regime. However, due to Nazi race laws he was forced to resign his lectureship in 1933; that year Pevsner moved to England, settling in Hampstead, where poet Geoffrey Grigson was his neighbour in Wildwood Terrace. Pevsner's first post was an 18-month research fellowship at the University of Birmingham, found for him by friends in Birmingham and funded by the Academic Assistance Council. A study of the role of the designer in the industrial process, the research produced a critical account of design standards in Britain which he published as An Enquiry into Industrial Art in England, he was subsequently employed as a buyer of modern textiles and ceramics for the Gordon Russell furniture showrooms in London. By this time Pevsner had completed Pioneers of the Modern Movement: from William Morris to Walter Gropius, his influential pre-history of what he saw as Walter Gropius's dominance of contemporary design.
Pioneers ardently championed Gropius's first two buildings on the grounds that they summed up all the essential goals of 20th-century architecture. In spite of that, the book remains an important point of reference in the teaching of the history of modern design, helped lay the foundation of Pevsner's career in England as an architectural historian. Since its first publication by Faber & Faber in 1936, it has gone through several editions and been translated into many languages; the English-language edition has been renamed Pioneers of Modern Design. Pevsner was "more German than the Germans" to the extent that he supported "Goebbels in his drive for'pure' non-decadent German art", he was reported as saying of the Nazis: "I want this movement to succeed. There is no alternative but chaos.... There are things worse than Hitlerism." Nonetheless, he was included in the Nazi Black Book as hostile to the Hitler regime. In 1940, Pevsner was taken to the internment camp at Liverpool, as an enemy alien.
Geoffrey Grigson wrote in his Recollections: "When at last two hard-faced Bow Street runners arrived in the early hours of the morning to take... I managed, clutching my pyjama trousers, to catch them up with the best parting present I could think of, an elegant little edition, a new edition, of Shakespeare's Sonnets." Pevsner was released after three months on the intervention of, among others, Frank Pick Director-General of the Ministry of Information. He spent some time in the months after the Blitz clearing bomb debris, wrote reviews and art criticism for the Ministry of Information's Die Zeitung, an anti-Nazi publication for Germans living in England, he completed for Penguin Books the Pelican paperback An Outline of European Architecture, which he had begun to develop while in internment. Outline would go into seven editions, be translated into 16 languages, sell more than half a million copies. In 1942, Pevsner secured two regular positions. From 1936 onwards he had been a frequent contributor to the Architectural Review and from 1943 to 1945 he stood in as its acting editor while the regular editor J. M. Richards was on active service.
Under the AR's influence, Pevsner's approach to modern architecture became more complex and more moderate. Early signs of a lifelong interest in Victorian architecture influenced by the Architectural Review, appeared in a series written under the pseudonym of "Peter F. R. Donner": Pevsner's "Treasure Hunts" guided readers down selected London streets, pointing out architectural treasures of the 19th century, he was closely involved with the Review's proprietor, H. de C. Hastings, in evolving the magazine's theories on picturesque planning. In 1942, Pevsner was appointed a part-time lecturer at Birkbeck College, London, he lectured at Cambridge University for 30 years, having been Slade professor there for a record six years from 1949 to 1955, would become the Slade professorship at Oxford in 1968. Framing all this was his career as a writer and editor. After moving to England, Pevsn
Sir Karl Raimund Popper was an Austrian-British philosopher and professor. Regarded as one of the 20th century's greatest philosophers of science, Popper is known for his rejection of the classical inductivist views on the scientific method in favour of empirical falsification. A theory in the empirical sciences can never be proven, but it can be falsified, meaning that it can and should be scrutinised by decisive experiments. Popper is known for his opposition to the classical justificationist account of knowledge, which he replaced with critical rationalism, namely "the first non-justificational philosophy of criticism in the history of philosophy". In political discourse, he is known for his vigorous defence of liberal democracy and the principles of social criticism that he came to believe made a flourishing open society possible, his political philosophy embraces ideas from all major democratic political ideologies and attempts to reconcile them, namely socialism/social democracy, libertarianism/classical liberalism and conservatism.
Karl Popper was born in Vienna in 1902 to upper-middle-class parents. All of Popper's grandparents were Jewish, but they were not devout and as part of the cultural assimilation process the Popper family converted to Lutheranism before he was born and so he received a Lutheran baptism, his father Simon Siegmund Carl Popper was a lawyer from Bohemia and a doctor of law at the Vienna University while his mother Jenny Schiff was of Silesian and Hungarian descent. Popper's uncle was the Austrian philosopher Josef Popper-Lynkeus. After establishing themselves in Vienna, the Poppers made a rapid social climb in Viennese society as Popper's father became a partner in the law firm of Vienna's liberal mayor Raimund Grübl and after Grübl's death in 1898 took over the business. Popper received his middle name after Raimund Grübl.. His father was a bibliophile who had 12,000–14,000 volumes in his personal library and took an interest in philosophy, the classics, social and political issues. Popper inherited both the disposition from him.
He would describe the atmosphere of his upbringing as having been "decidedly bookish."Popper left school at the age of 16 and attended lectures in mathematics, philosophy and the history of music as a guest student at the University of Vienna. In 1919, Popper became attracted by Marxism and subsequently joined the Association of Socialist School Students, he became a member of the Social Democratic Workers' Party of Austria, at that time a party that adopted the Marxist ideology. After the street battle in the Hörlgasse on 15 June 1919, when police shot eight of his unarmed party comrades, he became disillusioned by what he saw as the "pseudo-scientific" historical materialism of Marx, abandoned the ideology, remained a supporter of social liberalism throughout his life, he worked in street construction for a short amount of time, but was unable to cope with the heavy labour. Continuing to attend university as a guest student, he started an apprenticeship as a cabinetmaker, which he completed as a journeyman.
He was dreaming at that time of starting a daycare facility for children, for which he assumed the ability to make furniture might be useful. After that he did voluntary service in one of psychoanalyst Alfred Adler's clinics for children. In 1922, he did his matura by way of a second chance education and joined the University as an ordinary student, he completed his examination as an elementary teacher in 1924 and started working at an after-school care club for endangered children. In 1925, he went to the newly founded Pädagogisches Institut and continued studying philosophy and psychology. Around that time he started courting Josefine Anna Henninger, who became his wife. In 1928, he earned a doctorate under the supervision of Karl Bühler, his dissertation was titled Zur Methodenfrage der Denkpsychologie. In 1929, he obtained the authorisation to teach mathematics and physics in secondary school, which he started doing, he married his colleague Josefine Anna Henninger in 1930. Fearing the rise of Nazism and the threat of the Anschluss, he started to use the evenings and the nights to write his first book Die beiden Grundprobleme der Erkenntnistheorie.
He needed to publish one to get some academic position in a country, safe for people of Jewish descent. However, he ended up not publishing the two-volume work, but a condensed version of it with some new material, Logik der Forschung, in 1934. Here, he criticised psychologism, naturalism and logical positivism, put forth his theory of potential falsifiability as the criterion demarcating science from non-science. In 1935 and 1936, he took unpaid leave to go to the United Kingdom for a study visit. In 1937, Popper managed to get a position that allowed him to emigrate to New Zealand, where he became lecturer in philosophy at Canterbury University College of the University of New Zealand in Christchurch, it was here that he wrote his influential work Its Enemies. In Dunedin he met the Professor of Physiology John Carew Eccles and formed a lifelong friendship with him. In 1946, after the Second World War, he moved to the United Kingdom to become reader in logic and scientific method at the London School of Economics.
Three years in 1949, he was appointed professor of logic and scientific method at the University of London. Popper was president of the Aristotelian Society from 1958 to 1959. H
Balliol College, Oxford
Balliol College is one of the constituent colleges of the University of Oxford in England. One of Oxford's oldest colleges, it was founded around 1263 by John I de Balliol, a rich landowner from Barnard Castle in County Durham, who provided the foundation and endowment for the college; when de Balliol died in 1269 his widow, Dervorguilla, a woman whose wealth far exceeded that of her husband, continued his work in setting up the college, providing a further endowment, writing the statutes. She is considered a co‑founder of the college. Among the college's alumni are three former prime ministers, Harald V of Norway, five Nobel laureates, numerous literary and philosophical figures, including Adam Smith, Gerard Manley Hopkins, Aldous Huxley. John Wycliffe, who translated the Bible into English, was Master of the college in the 1360s. In 2018 Balliol had an endowment of £139.3m. Balliol College was founded in about 1263 by John I de Balliol under the guidance of Walter of Kirkham, the Bishop of Durham.
According to legend, the founder had abducted the bishop as part of a land dispute and as a penance he was publicly beaten by the bishop and had to support a group of scholars at Oxford. After de Balliol's death in 1268, his widow, Dervorguilla of Galloway, made arrangements to ensure the permanence of the college in that she provided capital and in 1282 formulated the college statutes, documents that survive to this day. Along with University and Merton, Balliol can claim to be the oldest Oxford college. Balliol’s claim is that a house of scholars was established by the founder in Oxford in around 1263, before Merton in 1274 and University in around 1280. Under a statute of 1881, New Inn Hall, one of the remaining medieval halls, was merged into Balliol College in 1887. Balliol acquired New Inn Hall's admissions and other records for 1831–1887 as well as the library of New Inn Hall, which contained 18th-century law books; the New Inn Hall site was sold and is now part of St Peter's College, Oxford.
In 1880, seven mischievous Balliol undergraduates published The Masque of B-ll--l, a broadsheet of forty quatrains making light of their superiors – the Master and selected Fellows and Commoners – and themselves. The outraged authorities suppressed the collection, only a few copies survived, three of which found their way into the College Library over the years, one into the Bodleian Library. Verses of this form are now known as Balliol rhymes; the best known of these rhymes is the one on Benjamin Jowett. This has been quoted and reprinted in every book about Jowett and about Balliol since. First come I. My name is J-W-TT. There's no knowledge but I know it. I am Master of this College; this and 18 others are attributed to Henry Charles Beeching. The other quatrains are much less well known. William Tuckwell included 18 of these quatrains in his Reminiscences in 1900, but they all came out only in 1939, thanks to Walter George Hiscock, an Oxford librarian, who issued them then and in a second edition in 1955.
For many years, there has been a traditional and fierce rivalry shown between the students of Balliol and those of its immediate neighbour to the east, Trinity College. It has manifested itself on the river; the rivalry reflects that which exists between Trinity College and Balliol's sister college, St John's College, Cambridge. In college folklore, the rivalry goes back to the late 17th century, when Ralph Bathurst, President of Trinity, was observed throwing stones at Balliol's windows. In fact, in its modern form, the rivalry appears to date from the late 1890s, when the chant or song known as a "Gordouli" began to be sung from the Balliol side; the traditional words run: Gordouli Face like a ham,Bobby Johnson says so And he should know. The shouting of chants over the wall is still known as "a Gordouli", the tradition continues as the students gather to sing following boat club dinners and other events; the traditional Gordouli is said to have been sung by Balliol and Trinity men in the trenches of Mesopotamia in the First World War.
Balliol became known for its radicalism and political activism in the 20th century, saw an abortive coup in the 1960s in which students took over the college and declared it "the People's Republic of Balliol". The contrast between the radical tendencies of many Balliol students and the traditional conservatism and social exclusivity of Trinity gave the rivalry an extra edge; the fact that Balliol had admitted a number of Indian and Asiatic students gave many of the taunts from the Trinity side a distinctly racist tone: Balliol students, for example, were sometime referred to as "Basutos". In Five Red Herrings, a Lord Peter Wimsey novel by Somerville alumna Dorothy L. Sayers, Lord Peter is asked whether he remembers a certain contemporary from Trinity. "'I never knew any Trinity men,' said Wimsey.'The Jews have no dealings with the Samaritans.'" Sayers alludes to the rivalry in Murder Must Advertise: Mr Ingleby, a Trinity man, comments, "If there is one thing more repulsive than another it is Balliolity."One of the wittier raids from Balliol, in 1962 or 1963, involved the turfing of the whole of Trinity JCR.
The last incident suspected to relate to the feud was the vandalisation of Trinity's SCR pond, which led to the death of all but one of the fish. For
Vienna is the federal capital and largest city of Austria, one of the nine states of Austria. Vienna is Austria's primate city, with a population of about 1.9 million, its cultural and political centre. It is the 7th-largest city by population within city limits in the European Union; until the beginning of the 20th century, it was the largest German-speaking city in the world, before the splitting of the Austro-Hungarian Empire in World War I, the city had 2 million inhabitants. Today, it has the second largest number of German speakers after Berlin. Vienna is host to many major international organizations, including the United Nations and OPEC; the city is located in the eastern part of Austria and is close to the borders of the Czech Republic and Hungary. These regions work together in a European Centrope border region. Along with nearby Bratislava, Vienna forms a metropolitan region with 3 million inhabitants. In 2001, the city centre was designated a UNESCO World Heritage Site. In July 2017 it was moved to the list of World Heritage in Danger.
Apart from being regarded as the City of Music because of its musical legacy, Vienna is said to be "The City of Dreams" because it was home to the world's first psychoanalyst – Sigmund Freud. The city's roots lie in early Celtic and Roman settlements that transformed into a Medieval and Baroque city, the capital of the Austro-Hungarian Empire, it is well known for having played an essential role as a leading European music centre, from the great age of Viennese Classicism through the early part of the 20th century. The historic centre of Vienna is rich in architectural ensembles, including Baroque castles and gardens, the late-19th-century Ringstraße lined with grand buildings and parks. Vienna is known for its high quality of life. In a 2005 study of 127 world cities, the Economist Intelligence Unit ranked the city first for the world's most liveable cities. Between 2011 and 2015, Vienna was ranked second, behind Melbourne. In 2018, it replaced Melbourne as the number one spot. For ten consecutive years, the human-resource-consulting firm Mercer ranked Vienna first in its annual "Quality of Living" survey of hundreds of cities around the world.
Monocle's 2015 "Quality of Life Survey" ranked Vienna second on a list of the top 25 cities in the world "to make a base within."The UN-Habitat classified Vienna as the most prosperous city in the world in 2012/2013. The city was ranked 1st globally for its culture of innovation in 2007 and 2008, sixth globally in the 2014 Innovation Cities Index, which analyzed 162 indicators in covering three areas: culture and markets. Vienna hosts urban planning conferences and is used as a case study by urban planners. Between 2005 and 2010, Vienna was the world's number-one destination for international congresses and conventions, it attracts over 6.8 million tourists a year. The English name Vienna is borrowed from the homonymous Italian version of the city's name or the French Vienne; the etymology of the city's name is still subject to scholarly dispute. Some claim that the name comes from Vedunia, meaning "forest stream", which subsequently produced the Old High German Uuenia, the New High German Wien and its dialectal variant Wean.
Others believe that the name comes from the Roman settlement name of Celtic extraction Vindobona meaning "fair village, white settlement" from Celtic roots, vindo-, meaning "bright" or "fair" – as in the Irish fionn and the Welsh gwyn –, -bona "village, settlement". The Celtic word Vindos may reflect a widespread prehistorical cult of a Celtic God. A variant of this Celtic name could be preserved in the Czech and Polish names of the city and in that of the city's district Wieden; the name of the city in Hungarian, Serbo-Croatian and Ottoman Turkish has a different Slavonic origin, referred to an Avar fort in the area. Slovene-speakers call the city Dunaj, which in other Central European Slavic languages means the Danube River, on which the city stands. Evidence has been found of continuous habitation in the Vienna area since 500 BC, when Celts settled the site on the Danube River. In 15 BC the Romans fortified the frontier city they called Vindobona to guard the empire against Germanic tribes to the north.
Close ties with other Celtic peoples continued through the ages. The Irish monk Saint Colman is buried in Melk Abbey and Saint Fergil served as Bishop of Salzburg for forty years. Irish Benedictines founded twelfth-century monastic settlements. Evidence of these ties persists in the form of Vienna's great Schottenstift monastery, once home to many Irish monks. In 976 Leopold I of Babenberg became count of the Eastern March, a 60-mile district centering on the Danube on the eastern frontier of Bavaria; this initial district grew into the duchy of Austria. Each succeeding Babenberg ruler expanded the march east along the Danube encompassing Vienna and the lands east. In 1145 Duke Henry II Jasomirgott moved the Babenberg family residence from Klosterneuburg in Lower Austria to Vienna. From that time, Vienna remained the center of the Babenberg dynasty. In 1440 Vienna became the resident city of the Habsburg dynasty, it grew to become the de facto capital of the Holy Roman Empire in 1437 and a cultural centre for arts and science and fine cuisine.
Hungary occupied the city between 1485 and 1490. In the 16th and 1
Archibald Vivian Hill, known as A. V. Hill, was an English physiologist, one of the founders of the diverse disciplines of biophysics and operations research, he shared the 1922 Nobel Prize in Physiology or Medicine for his elucidation of the production of heat and mechanical work in muscles. Born in Bristol, he was educated at Blundell's School and graduated from Trinity College, Cambridge as third wrangler in the mathematics tripos before turning to physiology. While still an undergraduate at Trinity College, he derived in 1909 what came to be known as the Langmuir equation; this is related to Michaelis-Menten kinetics. In this paper, Hill's first publication, he derived both the equilibrium form of the Langmuir equation, the exponential approach to equilibrium; the paper, written under the supervision of John Newport Langley, is a landmark in the history of receptor theory, because the context for the derivation was the binding of nicotine and curare to the "receptive substance" at the neuromuscular junction.
Hill made many exacting measurements of the heat released when skeletal muscles relax. A key finding was that heat is produced during contraction, which requires investment of chemical energy, but not during relaxation, passive, his earliest measurements used equipment left behind by the Swedish physiologist Magnus Blix, Hill measured a temperature rise of only 0.003 °C. After publication he learned that German physiologists had reported on heat and muscle contraction and he went to Germany to learn more about their work, he continually improved his apparatus to make it more sensitive and to reduce the time lag between the heat released by the preparation and its recording by his thermocouple. Hill is regarded, along with Hermann Helmholtz, as one of the founders of biophysics. While a student he had enrolled in the Officers Training Course. In 1914, at the outbreak of World War I, Hill because the musketry officer of the Cambridgeshire Regiment; the British made no effort to make use of their scientists.
At the end of 1915, while home on leave he was asked by Horace Darwin from the Ministry of Munitions to come for a day to advise them on how to train anti-aircraft gunners. On site, Hill proposed a simple two mirror method to determine airplane's heights. Transferred to Munitions, he realized that the mirrors could measure where smoke shells burst and if he fit this data with the equations describing a shell's flight they could provide accurate range tables for anti-aircraft guns. To measure and compute he assembled a team of men too old for conscription, Ralph H. Fowler, lads too young for service including Douglas Hartree and Arthur Milne. Someone dubbed his motley group "Hill's Brigands". In the war they worked on locating enemy planes from their sound, he sped between their working sites on his beloved motorcycle. At the end of the war Major Hill issued certificates to more than one hundred Brigands, he was awarded an OBE. Hill returned to Cambridge in 1919 before taking the chair in physiology at the Victoria University of Manchester in 1920 in succession to William Stirling.
Using himself as the subject —he ran every morning from 7:15 to 10:30 — he showed that running a dash relies on energy stores which afterwards are replenished by increased oxygen consumption. Paralleling the work of German Otto Fritz Meyerhof, Hill elucidated the processes whereby mechanical work is produced in muscles; the two shared the 1922 Nobel Prize in Medicine for this work. Hill introduced the concepts of maximal oxygen uptake and oxygen debt in 1922. In 1923 he succeeded Ernest Starling as professor of physiology at University College London, a few years becoming a Royal Society Research professor there, where he remained until retirement in 1951. In 1933, he became with Lord Beveridge and Lord Rutherford a founder member and vice-president of the Academic Assistance Council. By the start of the Second World War, the organisation had saved 900 academics from Nazi persecution, he prominently displayed in his laboratory a toy figure of Adolf Hitler with saluting arm upraised, which he explained was in gratitude for all the scientists Germany had expelled, some of whom were now working with him.
Hill believed that "Laughter is the best detergent for nonsense". In 1935 he served with Patrick Blackett and Sir Henry Tizard on the committee that gave birth to radar, he was biological secretary of the Royal Society. Both had been frustrated by the delay in putting scientists to work in the previous war; the Royal Society collated a list of scientists and Hill represented the Society at the Ministry of Labor. When the war came Hill led a campaign to liberate refugee scientists, interned, he served as an independent Member of Parliament for Cambridge University from 1940 to 1945. In 1940 he was posted to the British Embassy in Washington to promote war research in the still neutral United States, he was authorized to swap secrets with the Americans, but this could not work: how do you place a value on another's secret? Hill persuaded the British to show the Americans everything they were working on; the mobilization of Allied scientist was one of the major successes in the war. After the war he vigorously carried on research.
In 1951 his advocacy was rewarded by the establishment of a Biophysics Department under his leadership. In 1952 he became head of the British Association for the Advancement of Science and Secretary General of th
Quantum mechanics, including quantum field theory, is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles. Classical physics, the physics existing before quantum mechanics, describes nature at ordinary scale. Most theories in classical physics can be derived from quantum mechanics as an approximation valid at large scale. Quantum mechanics differs from classical physics in that energy, angular momentum and other quantities of a bound system are restricted to discrete values. Quantum mechanics arose from theories to explain observations which could not be reconciled with classical physics, such as Max Planck's solution in 1900 to the black-body radiation problem, from the correspondence between energy and frequency in Albert Einstein's 1905 paper which explained the photoelectric effect. Early quantum theory was profoundly re-conceived in the mid-1920s by Erwin Schrödinger, Werner Heisenberg, Max Born and others; the modern theory is formulated in various specially developed mathematical formalisms.
In one of them, a mathematical function, the wave function, provides information about the probability amplitude of position and other physical properties of a particle. Important applications of quantum theory include quantum chemistry, quantum optics, quantum computing, superconducting magnets, light-emitting diodes, the laser, the transistor and semiconductors such as the microprocessor and research imaging such as magnetic resonance imaging and electron microscopy. Explanations for many biological and physical phenomena are rooted in the nature of the chemical bond, most notably the macro-molecule DNA. Scientific inquiry into the wave nature of light began in the 17th and 18th centuries, when scientists such as Robert Hooke, Christiaan Huygens and Leonhard Euler proposed a wave theory of light based on experimental observations. In 1803, Thomas Young, an English polymath, performed the famous double-slit experiment that he described in a paper titled On the nature of light and colours.
This experiment played a major role in the general acceptance of the wave theory of light. In 1838, Michael Faraday discovered cathode rays; these studies were followed by the 1859 statement of the black-body radiation problem by Gustav Kirchhoff, the 1877 suggestion by Ludwig Boltzmann that the energy states of a physical system can be discrete, the 1900 quantum hypothesis of Max Planck. Planck's hypothesis that energy is radiated and absorbed in discrete "quanta" matched the observed patterns of black-body radiation. In 1896, Wilhelm Wien empirically determined a distribution law of black-body radiation, known as Wien's law in his honor. Ludwig Boltzmann independently arrived at this result by considerations of Maxwell's equations. However, it underestimated the radiance at low frequencies. Planck corrected this model using Boltzmann's statistical interpretation of thermodynamics and proposed what is now called Planck's law, which led to the development of quantum mechanics. Following Max Planck's solution in 1900 to the black-body radiation problem, Albert Einstein offered a quantum-based theory to explain the photoelectric effect.
Around 1900–1910, the atomic theory and the corpuscular theory of light first came to be accepted as scientific fact. Among the first to study quantum phenomena in nature were Arthur Compton, C. V. Raman, Pieter Zeeman, each of whom has a quantum effect named after him. Robert Andrews Millikan studied the photoelectric effect experimentally, Albert Einstein developed a theory for it. At the same time, Ernest Rutherford experimentally discovered the nuclear model of the atom, for which Niels Bohr developed his theory of the atomic structure, confirmed by the experiments of Henry Moseley. In 1913, Peter Debye extended Niels Bohr's theory of atomic structure, introducing elliptical orbits, a concept introduced by Arnold Sommerfeld; this phase is known as old quantum theory. According to Planck, each energy element is proportional to its frequency: E = h ν, where h is Planck's constant. Planck cautiously insisted that this was an aspect of the processes of absorption and emission of radiation and had nothing to do with the physical reality of the radiation itself.
In fact, he considered his quantum hypothesis a mathematical trick to get the right answer rather than a sizable discovery. However, in 1905 Albert Einstein interpreted Planck's quantum hypothesis realistically and used it to explain the photoelectric effect, in which shining light on certain materials can eject electrons from the material, he won the 1921 Nobel Prize in Physics for this work. Einstein further developed this idea to show that an electromagnetic wave such as light could be described as a particle, with a discrete quantum of energy, dependent on its frequency; the foundations of quantum mechanics were established during the first half of the 20th century by Max Planck, Niels Bohr, Werner Heisenberg, Louis de Broglie, Arthur Compton, Albert Einstein, Erwin Schrödinger, Max Born, John von Neumann, Paul Dirac, Enrico Fermi, Wolfgang Pauli, Max von Laue, Freeman Dyson, David Hilbert, Wi