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s
 Sommerfeld's Constant
See alpha, α.  Read More
 spin
Spin is a property of subatomic and atomic particles. While spin was originally thought of as a particle twirling on its(...)  Read More
 SternGerlach device
(Also called a “SternGerlach machine.”) The SternGerlach (SG) device detects the “quantum spin” of atoms and subatomic(...)  Read More
 superposition
Click for quantum superposition or click for superposition of classical waves.  Read More
 superposition, classical waves
This article is about superpositions of waves as understood In classical physics. See superposition, quantum mechanics for(...)  Read More
 superposition, quantum
The term "superposition" is used in both classical physics and quantum physics. In this article, "superposition" is(...)  Read More

t
 Tesla
A Tesla is a unit for measuring the strength of magnetism in any particular location. A Tesla is approximately the strength(...)  Read More
 theoretical physics
Theoretical physics is one of two branches of physics: theoretical and experimental. Like almost all other types of physics,(...)  Read More
 torque
For torque, see “moment of force.”  Read More
 true randomness
See entry for quantum randomness.  Read More

w
 wave
A wave is a movement that propagates through a medium. The accompanying animation demonstrates the motion of a seismic wave,(...)  Read More
 wave equation
This article starts with the nature of wave equations in classical physics and moves into a brief description of the(...)  Read More
 wave frequency
See frequency.  Read More
 wave function
A wave function, in quantum mechanics, is an equation. It describes the behavior of quantum particles, usually electrons.(...)  Read More
 wave function collapse
See article collapse of the wave function.
 waveform
The waveform is the shape of a wave. Below is a graph on paper of a waveform representing the sound waves created by blowing(...)  Read More
 wavefunction
See wave function.  Read More
 wavefunction collapse
See article collapse of the wave function.  Read More
 wavelength
Wavelength is a property of waves. It is the distance from wave crest to wave crest. Or from trough to trough—same distance.(...)  Read More

π
 π
See entry for pi.  Read More