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A virtual field trip is a guided exploration through the World Wide Web that organizes a collection of pre-screened, thematically based web pages into a structured online learning experience. (Foley, 2003). Since 2007, another dynamic and interactive form of a virtual field trip has been – and is – freely available.
[a] These far-field waves, for which E is (in the limit of long distance) equal to cB, are composed of actual photons. Actual and virtual photons are mixed near an antenna, with the virtual photons responsible only for the "extra" magnetic-inductive and transient electric-dipole effects, which cause any imbalance between E and cB. As distance ...
Virtual photons are a fundamental concept in particle physics and quantum field theory that play a crucial role in describing the interactions between electrically charged particles. Virtual photons are referred to as " virtual " because they do not exist as free particles in the traditional sense but instead serve as intermediate particles in ...
The four-momentum of the virtual particle is the difference between the four-momenta of the incoming and outgoing particles. Virtual particles corresponding to internal propagators in a Feynman diagram are in general allowed to be off shell, but the amplitude for the process will diminish depending on how far off shell they are. [ 4 ]
Static force fields are fields, such as a simple electric, magnetic or gravitational fields, that exist without excitations.The most common approximation method that physicists use for scattering calculations can be interpreted as static forces arising from the interactions between two bodies mediated by virtual particles, particles that exist for only a short time determined by the ...
In quantum field theory, and specifically quantum electrodynamics, vacuum polarization describes a process in which a background electromagnetic field produces virtual electron–positron pairs that change the distribution of charges and currents that generated the original electromagnetic field.
In virtual field trips, students visit real-world places or educational simulations to experience different lessons. Google Expeditions [ 9 ] allows students to take a shared field trip using smartphone headset technology under the control of a teacher's app. [ 10 ] Nearpod's VR provides lesson plans in all core subjects for primary grades, and ...
Quantum field theories describe nature in terms of fields.Each field has a complementary description as the set of particles of a particular type. A force between two particles can be described either as the action of a force field generated by one particle on the other, or in terms of the exchange of virtual force-carrier particles between them.