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  2. Delta ray - Wikipedia

    en.wikipedia.org/wiki/Delta_ray

    A delta ray is a secondary electron with enough energy to escape a significant distance away from the primary radiation beam and produce further ionization. [ 1 ] : 25 The term is sometimes used to describe any recoil particle caused by secondary ionization .

  3. Delta potential - Wikipedia

    en.wikipedia.org/wiki/Delta_potential

    The delta potential is the potential = (), where δ(x) is the Dirac delta function. It is called a delta potential well if λ is negative, and a delta potential barrier if λ is positive. The delta has been defined to occur at the origin for simplicity; a shift in the delta function's argument does not change any of the following results.

  4. Delta baryon - Wikipedia

    en.wikipedia.org/wiki/Delta_baryon

    The Delta states discussed here are only the lowest-mass quantum excitations of the proton and neutron. At higher spins , additional higher mass Delta states appear, all defined by having constant ⁠ 3 / 2 ⁠ or ⁠ 1 / 2 ⁠ isospin (depending on charge), but with spin ⁠ 3 / 2 ⁠ , ⁠ 5 / 2 ⁠ , ⁠ 7 / 2 ⁠ , ..., ⁠ 11 / 2 ...

  5. Dirac delta function - Wikipedia

    en.wikipedia.org/wiki/Dirac_delta_function

    Since there is no function having this property, modelling the delta "function" rigorously involves the use of limits or, as is common in mathematics, measure theory and the theory of distributions. The delta function was introduced by physicist Paul Dirac , and has since been applied routinely in physics and engineering to model point masses ...

  6. Communication physics - Wikipedia

    en.wikipedia.org/wiki/Communication_physics

    Communication physics aims to study and explain how a communication system works. This can be applied in a hard science way via Computer Communication or in the way of how people communicate. [1] An example of communication physics is how computers can transmit and receive data through networks.

  7. Quantum electrodynamics - Wikipedia

    en.wikipedia.org/wiki/Quantum_electrodynamics

    In particle physics, quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. [1] [2] [3] In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved. [2]

  8. Quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Quantum_mechanics

    Quantum mechanics is a fundamental theory that describes the behavior of nature at and below the scale of atoms. [2]: 1.1 It is the foundation of all quantum physics, which includes quantum chemistry, quantum field theory, quantum technology, and quantum information science.

  9. Kramers–Heisenberg formula - Wikipedia

    en.wikipedia.org/wiki/Kramers–Heisenberg_formula

    The Kramers–Heisenberg dispersion formula is an expression for the cross section for scattering of a photon by an atomic electron.It was derived before the advent of quantum mechanics by Hendrik Kramers and Werner Heisenberg in 1925, [1] based on the correspondence principle applied to the classical dispersion formula for light.