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Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable...

Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is...

Tsung-Dao Lee (Chinese: 李政道; pinyin: Lǐ Zhèngdào; born November 24, 1926) is a Chinese-American physicist, known for his work on parity violation, the...

George Eugene Uhlenbeck (December 6, 1900 – October 31, 1988) was a Dutch-American theoretical physicist. George Uhlenbeck was the son of Eugenius and...

Acoustic impedance and specific acoustic impedance are measures of the opposition that a system presents to the acoustic flow resulting from an acoustic...

George Green (14 July 1793 – 31 May 1841) was a British mathematical physicist who wrote An Essay on the Application of Mathematical Analysis to the Theories...

A bob is a heavy object (also called a "weight" or "mass") on the end of a pendulum found most commonly, but not exclusively, in pendulum clocks. Although...

Per-Olov Löwdin (October 28, 1916 – October 6, 2000) was a Swedish physicist, professor at the University of Uppsala from 1960 to 1983, and in parallel...

A liquid crystal thermometer, temperature strip or plastic strip thermometer is a type of thermometer that contains heat-sensitive (thermochromic) liquid...

Raphael Tsu (born December 27, 1931) is a Fellow of the American Physical Society and is Professor Emeritus of electrical engineering at the University...

Optical sectioning is the process by which a suitably designed microscope can produce clear images of focal planes deep within a thick sample. This is...

Aspect's experiment was the first quantum mechanics experiment to demonstrate the violation of Bell's inequalities with photons using distant detectors...

Robert A. Schommer (December 9, 1946 – December 12, 2001) was an American observational astronomer. He was a professor at Rutgers University and later...

Perveance is a notion used in the description of charged particle beams. The value of perveance indicates how significant the space charge effect is on...

Ursula "Uschi" Steigenberger (25 April 1951 — 12 December 2018) OBE FInstP was a German condensed matter physicist and director of the ISIS neutron source...

Non-linear phononics is the physics in solids created or triggered by large amplitude oscillations of phonons, the elementary vibration of the crystal...