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In Newtonian physics, free fall is any motion of a body where gravity is the only force acting upon it. In the context of general relativity, where gravitation...

The nuclear force (or nucleon–nucleon interaction, residual strong force, or, historically, strong nuclear force) is a force that acts between hadrons...

Brian Randolph Greene (born February 9, 1963) is an American physicist. Greene was a physics professor at Cornell University from 1990–1995, and has been...

In theoretical physics, negative mass is a hypothetical type of exotic matter whose mass is of opposite sign to the mass of normal matter, e.g. −1 kg....

X-ray photoelectron spectroscopy (XPS) is a surface-sensitive quantitative spectroscopic technique based on the photoelectric effect that can identify...

A free-electron laser (FEL) is a fourth generation light source producing extremely brilliant and short pulses of radiation. An FEL functions much as a...

Pioneers of gravitational theory In physics, theories of gravitation postulate mechanisms of interaction governing the movements of bodies with mass. There...

In quantum mechanics, the particle in a box model (also known as the infinite potential well or the infinite square well) describes the movement of a free...

In nuclear physics, the valley of stability (also called the belt of stability, nuclear valley, energy valley, or beta stability valley) is a characterization...

Fast fission is fission that occurs when a heavy atom absorbs a high-energy neutron, called a fast neutron, and splits. Most fissionable materials need...

In fluid dynamics, drag crisis (also known as the Eiffel paradox) is a phenomenon in which drag coefficient drops off suddenly as Reynolds number increases...

Mark D. Maughmer (born January 18, 1950) is a professor of Aerospace Engineering in the Department of Aerospace Engineering at The Pennsylvania State University...

Photon noise is the randomness[citation needed] in signal associated with photons arriving at a detector. For a simple black body emitting on an absorber...

George L. Siscoe (June 13, 1937 – April 9, 2022) was an American physicist and professor emeritus of space physics at Boston University. He made major...

Kevin Rolland Thompson (1954 – 2015) was the Group Director, Research and Development/Optics at Synopsys, Inc. His work contributed to developments in...