Visualizing group and phase velocity of a wave

[Sharlom]

Homework Statement

how to visualize group velocity and phase velocity?
I tried to to visualize it
The velocity of up and down vibration
Of the wave as phase velocity.
And
The velocity of the whole wave in propagating direction as group velocity.
AM I CORRECT OR WRONG?

Homework Equations

The Attempt at a Solution

 

[TSny]

I tried to to visualize it
The velocity of up and down vibration
Of the wave as phase velocity.

See the first animated figure here https://en.wikipedia.org/wiki/Phase_velocity and then see if you can describe in words the meaning of the phase velocity.

 

[Sharlom]

Thank u very much