Jun 19, 2019 · The wave vector is perpendicular to the direction of motion of waves, by definition. Let's say you observe ...

Think about what the wave vector represents, and what kind of wave your equation describes. The most general equation for the spatial variation of the electric field for a plane wave is …

Oct 16, 2016 · $\begingroup$ I would like to point out that the concept of the wave vector in lattice vibrations (or vibrations in general) has nothing to do with Quantum theory, it is a purely …

Mar 17, 2016 · The "vector wave equation" is actually just three uncoupled wave equations, so we might as well just talk about the wave equation $\nabla^2 \phi=\frac{1}{c^2} \ddot{\phi}$. For …

The "direction of wave propagation" is the direction of a wave's energy flow, and the direction that a small wave packet will move, i.e. the direction of the group velocity. For light waves, this is …

Feb 26, 2016 · People tend to set $\hbar=1$ and use momentum and wave vector synonymously. In a solid-state environment -- the case you are interested in -- the quantum numbers turn out …

Aug 26, 2020 · Jackson gives the standard argument that the elapsed phase of the wave is proportional to the number of wave-crests that have passed the observer, and thus it must be …

May 11, 2017 · These coordinates arise from using reduced wave vector coordinates, as stated in Dove Introduction to Lattice Dynamics, page 23: It is common practice to define the wave …

The basic classical interpretation of this expression is that EM waves, or any wave described by a null 'wave-4-vector' like gravitational waves, travel at the speed of light.

Jun 25, 2019 · The question is, how would we define the direction of the wave or rather how would we define the unit vector of the complex wave vector (I am thinking of something like …