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  • p

  • particle-wave duality
    When a photon hits your eye, it’s a particle. When it hits your eye, it interacts with a particular electron in the retina(...) - Read More
  • period
    If you were standing on a dock and water waves were coming at you, the period would be the time interval between waves. In(...) - Read More
  • Periodic Table of the Elements
    The Periodic Table of the Elements lists all the elements, over 100 of them, in a specific sequence. This includes the(...) - Read More
  • physical constant
    The constant c, the speed of light in a vacuum, is an example of a physical constant. It is a constant of nature, always(...) - Read More
  • pi
    Pi is symbolized π and pronounced like "pie." It is the mathematical symbol for the number 3.14159…, which goes on(...) - Read More
  • probability amplitude
    “Probability amplitude” is a term used in quantum physics. It’s a number that appears in Schrodinger’s Wave Equation. Let’s(...) - Read More
  • q

  • QFT
    See Quantum Field Theory. - Read More
  • quantities of dimension one
    For “quantities of dimension one,” see “dimensionless number.” - Read More
  • quantum
    One definition of “quantum” is: a tiny packet of energy at the atomic level. A quantum is the smallest possible unit of(...) - Read More
  • quantum angular momentum
    For quantum angular momentum, see angular momentum. - Read More
  • quantum decoherence
    For quantum decoherence, see  decoherence. - Read More
  • quantum entanglement
    In quantum physics, if two particles are entangled, their behavior is correlated. In addition, if a physicist obtains(...) - Read More
  • Quantum Field Theory
    Quantum Field Theory (QFT) is the current theory of how atomic and subatomic particles behave. It is the most up-to-date(...) - Read More
  • quantum mechanics
    In quantum mechanics, physicists study how tiny particles behave. These include atoms, the components of atoms like(...) - Read More
  • quantum number
    Electrons have a few handfuls of properties. Four have been selected as the electron’s “quantum numbers.” The quantum(...) - Read More
  • quantum physics
    For an understanding of quantum physics, see the definition of "quantum mechanics." Often, the two terms are used to mean(...) - Read More
  • quantum randomness
    Many quantum physicists view quantum mechanics as differing from classical physics in a fundamental way—quantum mechanics is(...) - Read More
  • quantum realm
    A number of interpretations of quantum mechanics postulate a “quantum realm.” These include the Transactional(...) - Read More
  • quantum spin
    See "spin." - Read More
  • quantum theory
    “Quantum theory” is the original name for the field that became known as “quantum mechanics" (which see). The connotations(...) - Read More