Image linked to original source; Image description: An animation of a wave packet with equal phase and group velocities

    Figure: An animation of a wave packet with equal phase and group velocities

    Caption: An animation of the "propagation of a wave packet in a non-dispersive transmission medium. We can see there is NO difference between phase velocity and group velocity." (Slightly edited.) The animation is cartoon of a propagating wave packet or photon.

    Credit and/or file tracking information follows to the divider line:

    Image Credit/Permission: Frederic Perez (AKA User:Fffred), 2006 / Public domain.
    Image link: Wikipedia: File:Wave packet (no dispersion).gif.
    Local file: local link: wave_packet_animation.html.
    File: Waves file: wave_packet_animation.html.