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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-packetsAs 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)/02%3A_Waves_in_Two_and_Three_Dimensions/2.02%3A_Plane_WavesFor 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/Bookshelves/University_Physics/Radically_Modern_Introductory_Physics_Text_I_(Raymond)/01%3A_Waves_in_One_Dimension/1.09%3A_Group_VelocitySince 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/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_MagnetismElectricity 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_MagnetismElectricity and magnetism from statics to electromagnetic fields as described by Maxwell's equations
