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Group And Phase Velocity Pdf

group and phase velocity pdf

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According to quantum physics, particles sometimes behave like waves. In some cases, waves behave like particles.

Quantum Mechanics:Wave packet, phase velocity and group

The group velocity of a wave is the velocity with which the overall envelope shape of the wave's amplitudes—known as the modulation or envelope of the wave—propagates through space. For example, if a stone is thrown into the middle of a very still pond, a circular pattern of waves with a quiescent center appears in the water, also known as a capillary wave. The expanding ring of waves is the wave group , within which one can discern individual wavelets of differing wavelengths traveling at different speeds. The shorter waves travel faster than the group as a whole, [ citation needed ] [ dubious — discuss ] but their amplitudes diminish as they approach the leading edge of the group. The longer waves travel more slowly, and their amplitudes diminish as they emerge from the trailing boundary of the group. The group velocity v g is defined by the equation: [2] [3] [4] [5].

Folder Name. Folder Description. Phase velocity. Subscribe to Digital Library. Erratum Email Alerts notify you when an article has been updated or the paper is withdrawn.

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Difference Between Phase Velocity and Group Velocity

All data analysis and representation was accomplished using Python 3. Simulations are also preformed using this script. We use a library called WrightTools to aid in data import and representati…. Free and easy to use, the Open Science Framework supports the entire research lifecycle: planning, execution, reporting, archiving, and discovery. Thank you for your patience.

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Introduction

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Phase and group velocity in a drifting magnetoplasma Abstract: Relationship between group and phase velocities of electromagnetic waves in a drifting uniaxial plasma is discussed. When determining whether propagation between two points is possible, the allowed direction of the group velocity vector and not that of the phase velocity vector is important. Article :.

The group velocity of a wave is the velocity with which the overall envelope shape of the wave's amplitudes—known as the modulation or envelope of the wave—propagates through space. For example, if a stone is thrown into the middle of a very still pond, a circular pattern of waves with a quiescent center appears in the water, also known as a capillary wave. The expanding ring of waves is the wave group , within which one can discern individual wavelets of differing wavelengths traveling at different speeds. The shorter waves travel faster than the group as a whole, [ citation needed ] [ dubious — discuss ] but their amplitudes diminish as they approach the leading edge of the group. The longer waves travel more slowly, and their amplitudes diminish as they emerge from the trailing boundary of the group.

A wavefront is a line or surface of constant phase.

We demonstrate that the ratio of group to phase velocity has a simple relationship to the orientation of the electromagnetic field. In nondispersive materials, opposite group and phase velocity corresponds to fields that are mostly oriented in the propagation direction. More generally, this relationship including the case of dispersive and negative-index materials offers a perspective on the phenomena of backward waves and left-handed media. As an application of this relationship, we demonstrate and explain an irrecoverable failure of perfectly matched layer absorbing boundaries in computer simulations for constant cross-section waveguides with backward-wave modes and suggest an alternative in the form of adiabatic isotropic absorbers.

Wave:de-localized spread out in space and time How do we associate a wave nature to a particle? What could represent both wave and particle? Find a description of a particle which is consistent with our notion of both particles and waves Fits the wave description Localized in space A Wave Packet 3 of the group envelope is non-zero only in the neighbourhood of the particle A wave packet is localized a good representation for a particle! The spread of wave packet in wavelength depends on the required degree of localization in space the central wavelength is given by What is the velocity of the wave packet?

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2 Comments

  1. Natasha P.

    23.04.2021 at 08:24
    Reply

    Wave:de-localized spread out in space and time How do we associate a wave nature to a particle?

  2. Mark T.

    27.04.2021 at 01:23
    Reply

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