Question

What is the difference between phase velocity and phase angle?

Answer 1

Phase velocity and phase angle are two entirely different things and this difference is evident by their very definitions and formulae.

Phase velocity :

The phase velocity of a wave is defined as the rate at which the phase of the wave travels in space. If angular frequency of the wave is and it's wave vector is   then phase velocity ,

Phase angle :

Suppose a wave is represented by ,

Then angle gives the phase of the wave, it's a shift relative to the wave with , it's tells us by how much fraction of period()   leads or lags the function.

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