direction of propagation

direction of propagation

[də′rek·shən əv ‚präp·ə′gā·shən]
(physics)
The normal to a surface of constant phase, in a propagating wave.
The direction of the group velocity.
The direction of time-average energy flow.(In a homogeneous isotropic medium, these three directions coincide.)
References in periodicals archive ?
The angular momentum in the direction of propagation, the spin, should be nonzero and have the constant value h/2[pi].
The acoustic velocities of both modes are proportional to the direction of propagation within the laminate plate.
S is the electromagnetic energy flux along the direction of propagation [6, see p.
Since the diffusion transfer of the combustion products in the direction of propagation of the front is almost completely negligible [1], during the diffusion process in the direction normal to the propagation of the combustion front, the front itself travels the distance [square root of (][a.
This makes it possible to direct the wave's direction of propagation so as to avoid objects in the vicinity of the beam that may cause signal reflections.
Branching cracks propagate through the stainless steel cladding, and they either stop where the cladding meets the base material or change their direction of propagation along the interface.
Unlike with normal dispersion, anomalous dispersion has the extraordinary effect of enabling a light pulse to appear again at a distant point along its direction of propagation and produce the exact shape of the light pulse that entered the chamber.
The inherent anisotropy of composite structures also means that the direction of propagation of the waves will also have an effect on the received signal.
Using the "right hand rule," with the index finger of the right hand pointing in the direction of the electric field (down) and the middle finger pointing in the direction of the magnetic field (into the paper), your thumb will point in the direction of propagation (to the right).
Then, the direction of propagation is perpendicular to the spin, just like a bicycle, moving into a direction which is perpendicular to the axes of the wheels.
The photons correspond to an energy flow along the direction of propagation in 3-space resulting from the Poynting vector.
The modifications of the wave properties owing to wind wave propagation up to the surf zone were estimated, based on the linear wave theory and the assumption that the wave energy is concentrated in monochromatic waves with the period equal to the peak period and the direction of propagation equal to the mean propagation direction.

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