quantum theory

Werner Heisenberg and the Uncertainty Principle

Werner Heisenberg and the Uncertainty Principle

On December 5, 1901, German theoretical physicist and Nobel Prize laureate Werner Heisenberg was born, who along with Max Born and Pascual Jordan laid the foundations of quantum mechanics. He is probably best known for his Uncertainty Principle, asserting a fundamental limit to the precision with which certain physical properties can be known. “The more precise the measurement of position, the more imprecise the measurement of momentum, and vice versa.” — Werner Heisenberg,…
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Max Planck and the Quantum Theory

Max Planck and the Quantum Theory

On April 23, 1858, German theoretical physicist Max Planck was born, who originated quantum theory, which won him the Nobel Prize in Physics in 1918. Max Karl Ernst Ludwig Planck was born in Kiel, but remained most of his school years in Munich. There he was introduced to the world of physics. After his graduation at the age of 16, he did not easily decide to study physics. His main interest belonged to…
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Chien-Shiung Wu and the Conservation of Parity

Chien-Shiung Wu and the Conservation of Parity

On May 31, 1912, Chinese-American experimental physicist Chien-Shiung Wu was born. Wu is best known for conducting the Wu experiment, which contradicted the hypothetical law of conservation of parity. This discovery resulted in her colleagues Tsung-Dao Lee and Chen-Ning Yang winning the 1957 Nobel Prize in physics, and also earned Wu the inaugural Wolf Prize in Physics in 1978. Her expertise in experimental physics evoked comparisons to Marie Curie. Chien-Shiung Wu was…
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Julian Schwinger and Quantum Electrodynamics

Julian Schwinger and Quantum Electrodynamics

On February 12, 1918, US-american theoretical physicist and Nobel Laureate Julian Seymour Schwinger was born. Schwinger is best known for his work on the theory of quantum electrodynamics (QED), in particular for developing a relativistically invariant perturbation theory, and for renormalizing QED to one loop order. Julian Seymour Schwinger was born in New York City, to Orthodox Jewish parents originally from Poland, Belle and Benjamin Schwinger, a prosperous garment manufacturer. Julian attended…
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Charles Coulson and the Molecular Orbital Theory

Charles Coulson and the Molecular Orbital Theory

On December 13, 1910, British applied mathematician and theoretical chemist Charles Coulson was born. Coulson was as a pioneer of the application of the quantum theory of valency to problems of molecular structure, dynamics and reactivity. He is known for the application of molecular orbital theory to chemical bonding, the electronic structures of molecules and the concept of partial valency, and developed many mathematical techniques for solving chemical and physical problems. Charles…
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George Uhlenbeck and the Electron Spin

George Uhlenbeck and the Electron Spin

On December 6, 1900, Dutch-American theoretical physicist George Eugene Uhlenbeck was born. Together with with Samuel A. Goudsmit, Uhlenbeck proposed the concept of electron spin (Jan 1925) – a fourth quantum number which was a half integer. Early Life George Uhlenbeck was the son of Eugenius Uhlenbeck, who served in the Dutch East Indian Army, and Anne Beeger Uhlenbeck, the daughter of a Dutch major general. He attended the Hogere Burgerschool (High…
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Gustav Hertz and the Franck-Hertz Experiment

Gustav Hertz and the Franck-Hertz Experiment

On October 30, 1975, German experimental physicist and Nobel Prize winner Gustav Ludwig Hertz passed away. A nephew of Heinrich Rudolf Hertz, he received the Nobel Prize for Physics in 1925 together with James Franck for the Franck-Hertz experiment, which confirmed the quantum theory that energy can be absorbed by an atom only in definite amounts and provided an important confirmation of the Bohr atomic model. Early Years and Education Gustav Hertz was…
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Erwin Schrödinger and his Famous Thought Experiment

Erwin Schrödinger and his Famous Thought Experiment

On August 12, 1887, Austrian physicist and Nobel Laureate Erwin Schrödinger was born. Schrödinger developed a number of fundamental results in the field of quantum theory, which formed the basis of wave mechanics: he formulated the wave equation and revealed the identity of his development of the formalism and matrix mechanics. Schrödinger proposed an original interpretation of the physical meaning of the wave function. Although many of you are not physicists, you…
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Arnold Sommerfeld and the Quantum Theory

Arnold Sommerfeld and the Quantum Theory

  On December 5, 1868, German theoretical physicist Arnold Sommerfeld was born. Sommerfeld pioneered developments in atomic and quantum physics, and also educated and mentored a large number of students for the new era of theoretical physics. He served as PhD supervisor for more Nobel prize winners in physics than any other supervisor to date. He introduced the 2nd quantum number (azimuthal quantum number) and the 4th quantum number (spin quantum number).…
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Aage Niels Bohr and the Understanding of the Nuclear Structure

Aage Niels Bohr and the Understanding of the Nuclear Structure

On June 19, 1922, Danish nuclear physicist and Nobel laureate Aage Niels Bohr was born, son of the famous physicist and Nobel laureate Niels Bohr. Aage Bohr shared the 1975 Nobel Prize for Physics with Ben R. Mottelson and James Rainwater “for the discovery of the connection between collective motion and particle motion in atomic nuclei and the development of the theory of the structure of the atomic nucleus based on this connection.” Aage…
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