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Envelope (waves) In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. [1] The envelope thus generalizes the concept of a constant amplitude into an instantaneous amplitude. The figure illustrates a modulated sine wave varying between an upper envelope and a lower envelope.
Wave. Surface waves in water showing water ripples. In physics, mathematics, engineering, and related fields, a wave is a propagating dynamic disturbance (change from equilibrium) of one or more quantities. Periodic waves oscillate repeatedly about an equilibrium (resting) value at some frequency. When the entire waveform moves in one direction ...
Ron Jones (born 1941) is an American writer and formerly a teacher in Palo Alto, California. He is best known for his classroom exercise called "The Third Wave" and the book he wrote about the event, which inspired the made-for-TV movie The Wave and other works, including a theatrical film in 2008. The original TV movie won the Emmy and Peabody ...
The Wave. (1981 film) 44 mins. The Wave is a made-for-TV movie directed by Alex Grasshoff, based on The Third Wave experiment put on by teacher Ron Jones to explain to his students how the German populace could accept the actions of the Nazi regime. [1] It debuted October 4, 1981, and aired again almost two years later as an ABC Afterschool ...
Flat Stanley. Flat Stanley is an American children's book series written by author Jeff Brown (January 1, 1926 – December 3, 2003). [1] The idea for the book began as a bedtime story for Brown’s sons, which Brown turned into the first Flat Stanley book. The first book featured illustrations by Tomi Ungerer and was published in 1964. [2]
Wave packet. A looped animation of a wave packet propagating without dispersion: the envelope is maintained even as the phase changes. In physics, a wave packet (also known as a wave train or wave group) is a short burst of localized wave action that travels as a unit, outlined by an envelope. A wave packet can be analyzed into, or can be ...
The Wave is a 1981 young adult novel by Todd Strasser under the pen name Morton Rhue (though it has been reprinted under Todd Strasser's real name). It is a novelization of a teleplay by Johnny Dawkins for the movie The Wave, a fictionalized account of the "Third Wave" teaching experiment by Ron Jones that took place in an Ellwood P. Cubberley High School history class in Palo Alto, California.
The phase velocity is the rate at which the phase of the wave propagates in space. The group velocity is the rate at which the wave envelope, i.e. the changes in amplitude, propagates. The wave envelope is the profile of the wave amplitudes; all transverse displacements are bound by the envelope profile.