Top Results for Physics

German physicist Wilhelm Roentgen discovered X-rays in 1895 while investigating electrical discharges. He produced and detected electromagnetic radiation in a wavelength range that became known as X-rays, also called Roentgen rays. The discovery showed that these rays could pass through materials op...

Wilhelm Conrad Röntgen was a German physicist and mechanical engineer who discovered X-rays in 1895 while experimenting with cathode rays at the University of Würzburg. Because the nature of the radiation was unknown, he termed it X-radiation, a name that was adopted internationally. His discovery r...

Published in 1687, the first edition of Isaac Newton's Philosophiae Naturalis Principia Mathematica is a printed Latin book that helped establish classical mechanics. Newton set out his laws of motion and theory of universal gravitation through mathematical arguments, bringing the movement of object...

Albert Einstein changed physics by showing that familiar ideas about space and time depend on motion and gravity. His 1905 work introduced special relativity and the mass-energy relation E=mc², while his light-quantum proposal helped explain the photoelectric effect and develop quantum theory. Gener...

William Thomson, 1st Baron Kelvin (1824–1907), was a British mathematical physicist and engineer. He played a central role in formulating the first and second laws of thermodynamics and proposed an absolute temperature scale, now measured in kelvins. Thomson also contributed to the successful laying...

Galileo Galilei helped make observation, experiment, and mathematics central to the study of nature. With improved telescopes, he observed Jupiter's moons, the phases of Venus, sunspots, and the Moon's uneven surface. These findings challenged important parts of the traditional picture of the heaven...

Nicolas Léonard Sadi Carnot (1796–1832) was a French physicist and military engineer whose 1824 treatise Réflexions sur la puissance motrice du feu established foundational principles of heat engine efficiency. The work introduced the idealized cyclic process now called the Carnot cycle, demonstrati...

William Thomson, later titled 1st Baron Kelvin, helped establish the mathematical foundations of classical thermodynamics. An Irish-born Scottish mathematician and physicist, he developed an absolute temperature scale that became known as the Kelvin scale. Its reference point is absolute zero, givin...

Gravitational wave astronomy is a field of modern physics that detects ripples in spacetime caused by accelerating massive objects. These waves, predicted by Einstein’s theory of general relativity, offer an entirely new way to observe cosmic events previously invisible to traditional telescopes. Sc...

This manuscript represents Albert Einstein’s groundbreaking 1905 paper, “Zur Elektrodynamik bewegter Körper” (On the Electrodynamics of Moving Bodies). Published in the *Annalen der Physik*, it details his revolutionary theory of special relativity. The document showcases Einstein's initial formulat...

Thomas Young (1773–1829) was a British polymath whose contributions spanned physics, physiology, linguistics, and medicine. In 1801 he conducted the double-slit experiment, demonstrating interference patterns in light and providing foundational evidence for the wave theory of light. He also proposed...

Lord Kelvin, born William Thomson, was a prominent Irish-Scottish mathematical physicist and engineer who worked in the 19th century. He made significant contributions to the mathematical analysis of electricity and the formulation of the first and second laws of thermodynamics. His most famous lega...

Across logic and natural philosophy, Aristotle organized knowledge into systems that influenced later scholarship for centuries. His studies also covered metaphysics and ethics, linking questions about nature with questions about reasoning and human life. In biology, he described and classified many...

Sir Joseph John Thomson (1856–1940) was a British physicist who served as the head of the Cavendish Laboratory at the University of Cambridge. In 1897, he conducted experiments with cathode rays that led to the discovery of the electron, demonstrating that atoms are composed of even smaller subatomi...

Werner Heisenberg is best known for formulating the uncertainty principle, a cornerstone of quantum mechanics. This principle states that it's impossible to simultaneously know both the position and momentum of a particle with perfect accuracy. His work profoundly impacted our understanding of measu...

Hans Christian Ørsted (1777-1851) was a Danish physicist who made significant contributions to the field of electromagnetism. In April 1820, he observed that an electric current could deflect a compass needle, establishing the fundamental relationship between electricity and magnetism. This discover...

Archimedes of Syracuse connected mathematical proof with questions about physical behavior. His work on buoyancy explains the upward force on an immersed object through the weight of the fluid it displaces. He also developed a mathematical treatment of levers and equilibrium, making major contributi...

Max Planck was a German physicist whose groundbreaking work fundamentally shaped modern physics. He established quantum theory by introducing the concept of energy existing in discrete quanta – particles with specific amounts. This revolutionized understanding of light and matter. His proposed const...

Niels Bohr (1885-1962) made pivotal contributions to atomic structure and quantum mechanics. His model of the atom, incorporating quantized energy levels, explained the stability of atoms and the emission of light. Bohr's development of the Copenhagen interpretation of quantum mechanics, while contr...

Marie Curie was a pioneer in the field of radioactivity, a term she coined. Her relentless research, conducted under difficult conditions, led to the discovery of two new elements: polonium (named for her homeland) and radium. This work revolutionized physics and chemistry, demonstrating that atoms...

Richard Feynman was a pioneering 20th-century American theoretical physicist. His work fundamentally shaped quantum electrodynamics through the development of diagrammatic methods – a visual approach to complex calculations. He received the Nobel Prize in Physics in 1965 for this achievement and is...

Marie Curie's research notebooks, which date to the late 19th and early 20th centuries, are historical scientific artifacts currently stored at the Bibliothèque nationale de France in Paris. Because her work with radium and polonium involved constant exposure to radioactive materials, the notebooks...

Peggle Deluxe is a 2D puzzle game developed by PopCap Games and released in 2007. The gameplay tasks players with shooting a limited number of metal balls from the top of the screen to clear all orange pegs, utilizing a physics-based pachinko mechanic. Players can select from various cartoon charact...

Cosmos: A Spacetime Odyssey presents a comprehensive exploration of astronomy and physics for adults seeking an engaging educational experience. Hosted by Neil deGrasse Tyson, the series utilizes breathtaking visuals and historical context to illuminate fundamental scientific concepts related to spa...

Erwin Schrödinger was an Austrian theoretical physicist whose work fundamentally shaped the development of quantum mechanics. He developed wave mechanics, a key component of this field, and introduced the famous Schrödinger equation. His investigations into the behavior of particles at the atomic le...

Enrico Fermi was a pioneering Italian-American physicist instrumental in shaping 20th-century science. His leadership led to the construction of the world’s first nuclear reactor at the University of Chicago. He made significant advancements across theoretical and experimental physics including cont...

Léon Foucault was a French physicist renowned for his experimental contributions to the measurement of the speed of light and the proof of Earth's rotation. In 1851, he provided the first simple, empirical proof of the planet's rotation by suspending a heavy pendulum from the ceiling of the Panthéon...

Ernest Rutherford was a pioneering 20th-century physicist born in New Zealand. His groundbreaking experiments with alpha particles and gold foil established the concept of the atomic nucleus—the dense central core containing most of an atom’s mass. This work fundamentally shaped nuclear physics and...

Sir Isaac Newton stands as the colossus of the Scientific Revolution, synthesizing the work of predecessors like Galileo and Kepler into a unified system of the world. His magnum opus, 'Philosophiæ Naturalis Principia Mathematica' (1687), laid out his three laws of motion and the law of universal gr...