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    • https://phys.libretexts.org/Bookshelves/Nuclear_and_Particle_Physics/Introduction_to_Applied_Nuclear_Physics_(Cappellaro)/06%3A_Time_Evolution_in_Quantum_Mechanics/6.02%3A_Evolution_of_Wave-packets
      As usual, the variance of the initial wavefunction and of its Fourier transform are relates: Δk=1/(2Δx), where Δx is the initial width of the wave-packet and Δk t...As usual, the variance of the initial wavefunction and of its Fourier transform are relates: Δk=1/(2Δx), where Δx is the initial width of the wave-packet and Δk the spread in the momentum.
    • https://phys.libretexts.org/Bookshelves/University_Physics/Radically_Modern_Introductory_Physics_Text_I_(Raymond)/01%3A_Waves_in_One_Dimension/1.09%3A_Group_Velocity
      Since the speed of movement of wave crests is the phase speed and the speed of movement of wave packets is the group velocity, the two velocities are equal and the non-dispersive nature of this case i...Since the speed of movement of wave crests is the phase speed and the speed of movement of wave packets is the group velocity, the two velocities are equal and the non-dispersive nature of this case is confirmed. Figure \PageIndex2A shows a dispersive wave in which the group velocity is twice the phase speed, while Figure \PageIndex2B shows a case in which the group velocity is actually opposite in sign to the phase speed.
    • https://phys.libretexts.org/Bookshelves/University_Physics/Radically_Modern_Introductory_Physics_Text_I_(Raymond)/02%3A_Waves_in_Two_and_Three_Dimensions/2.02%3A_Plane_Waves
      For light and ocean waves the frequency depends only on the magnitude of the wave vector, whereas for gravity waves it depends only on the wave vector’s direction, as defined by the angle θ in the upp...For light and ocean waves the frequency depends only on the magnitude of the wave vector, whereas for gravity waves it depends only on the wave vector’s direction, as defined by the angle θ in the upper right panel.
    • https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/zz%3A_Back_Matter/10%3A_13.1%3A_Appendix_J-_Physics_Formulas_(Wevers)/1.02%3A_Electricity_and_Magnetism
      Electricity and magnetism from statics to electromagnetic fields as described by Maxwell's equations
    • https://phys.libretexts.org/Learning_Objects/A_Physics_Formulary/Physics/02%3A_Electricity_and_Magnetism
      Electricity and magnetism from statics to electromagnetic fields as described by Maxwell's equations
    • https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electromagnetics_and_Applications_(Staelin)/09%3A_Electromagnetic_Waves/9.02%3A_Waves_incident_on_planar_boundaries_at_angles
      This page covers the determination of electromagnetic fields through boundary value problems, examining wave propagation at boundaries and using complex notation for frequency-dependent phenomena. It ...This page covers the determination of electromagnetic fields through boundary value problems, examining wave propagation at boundaries and using complex notation for frequency-dependent phenomena. It discusses TE and TM wave behavior, boundary conditions, and Snell's law. The text further details evanescent waves, lossy media impact on wave propagation, and reflection/transmission characteristics in conductors.

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