waves - What actually is the wavevector in the context of phonons …
Oct 16, 2016 · Therefore, due to the periodic discrete lattice positions of the atoms, wave vectors outside this zone can be considered to be equivalent to a wave vector in the Brillouin zone. The dispersion relations $\omega(\mathbf{k})$ usually have multiple branches for the longitudinal and transverse acoustic waves.
wavelength - Components of wave vector - Physics Stack Exchange
Jun 19, 2019 · The wave vector is perpendicular to the direction of motion of waves, by definition. Let's say you observe ...
Relation between wave number and wave vector? [closed]
Sep 11, 2018 · The wave vector is normal to the surfaces of constant phase ('wave fronts') with a length inversely proportional to wavelength. It corresponds to wave momentum, and is one way to describe wave propagation (another one is energy flux, which, in case of electromagnetic waves, is given by the Poynting vector; depending on the medium, wave and ...
waves - Direction of the wavevector? - Physics Stack Exchange
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 also the direction of the Poynting vector. On the other hand, the wave vector points in …
Determining wave vector - Physics Stack Exchange
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 $$\mathbf{E}(\mathbf{r}) = \mathbf{E_{0}} e^{-i\mathbf{k} \bullet \mathbf{r}}$$ where $\mathbf{E_{0}}$ is some vector with no dependence on $\mathbf{r}$.
special relativity - Four-wavevector $k$ - Physics Stack Exchange
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 frame-independent. Also, interference effects are due to differences in the phase of waves.
Reduced $\\mathbf{k}$-vector in the first Brillouin zone
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 vector as normalized by the first reciprocal lattice vector lying along the direction of the wave vector. This gives hat is called the reduced wave vector. For our one ...
What does an electron's wavevector mean inside of a crystal?
It seems that you already understand, that the wave vector of an "electron" quasiparticle in a crystal (or in any periodic potential) is not the same thing as the actual momentum of "the real" electron. So now you are kinda questioning the "meaning" of the concept of a quasiparticle itself.
general relativity - What does it mean that a wavevector is null ...
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.
Physical meaning of wave vector? - Physics Stack Exchange
My notation here is that k is the wave vector and Em is the magnitude and direction of the wave. Plugging this into the wave equation gives us the following: $$ k_x^2 +k_y^2 + k_z^2 = \frac{w^2}{c^2} $$ Which implies that the magnitude of the wave vector is equal to the wave number, k = w/c.