# Questions tagged [phase-velocity]

The tag has no usage guidance.

83 questions
Filter by
Sorted by
Tagged with
1answer
36 views

### Huygens principle (phase velocity)

According to my physics book, the Huygens principle states that "given a wave front S at the instant of time t each point of this can be considered as a source of secondary spherical waves that ...
1answer
26 views

### How to convert the velocity field to a pressure field to information relating to sound level?

I am studying jet mixing noise and I am given a velocity field, with Vx, Vy, Vz in x and y coordinates. I wanted to know if there's a method in which I could find some information relating to the ...
1answer
49 views

### What is the mechanism of the Askaryan effect?

(Quoted largely from Wikipedia): Askaryan radiation, known otherwise as the Askaryan effect, is a phenomenon which occurs when a particle traveling faster than the phase velocity of light in a dense ...
0answers
24 views

### Group Velocity Clarification

There is something that confuses me a bit about how group velocity is sometimes introduced and explained. For example, Walter Lewin (great professor) in his lectures uploaded on youtube, explains the ...
0answers
36 views

### Is there a general relationship between the density operator and phase velocity?

I am trying to solve $\int v_pd\rho$ for a time-independent, 1-particle density operator $\rho$ (acquired, more or less, from a partial trace of complex scalar field operators projected upon the ...
2answers
37 views

### Definition of Phase Shifts (Coupled Oscillators)

I was wondering if maybe someone could look at this excerpt from a textbook (Attached). It states that “the displacement of the two masses will be in opposite directions (out of phase by pi)” but I ...
1answer
58 views

### Phase and group velocity calculation

I have a wave described by $A \sin(k_x x) \exp(i(k_y y− ωt))$. This wave is propagating in $+y$ direction. However its angular frequency is given by $k_x^2 + k_y^2 = (w/c)^2$. If I want to calculate ...
2answers
47 views

### Error in an argument for classical transverse Doppler effect

I was recently reviewing the classical Doppler effect for intro physics students. One aspect of such is that there's no transverse effect: An observer moving perpendicular to the motion of a plane ...
0answers
73 views