Standing wave velocity My question is simple:
How is it that a standing wave has velocity? I mean, it's not travelling...
A lot of equations depend on this concept, for example: $f_n = \frac{nv}{2L}$   
Here we're finding the frequency of the nth harmonic given the velocity of the wave on a string.
 A: The velocity term here means the speed of a wave traveling through the medium.  Take, for instance, a pipe resonating, like in an organ (the equations are basically the same).  The v term means the speed of sound in air, even though the wave is standing.  The same thing applies here - v means "speed of any wave" not just "speed of this particular wave".
A: The velocity of the standing wave is the velocity of the incoming and reflecting wave that formed this standing wave.
See http://www.physicsclassroom.com/class/waves/Lesson-4/Formation-of-Standing-Waves
A: In that formula, v is the speed of wave propagation in the medium, not the speed of that particular standing wave.
Frequency of a standing wave is so conspicuously supposed to depend on the wave speed in the medium.
Faster the component waves travel, higher will be the frequency with which the 'points' of standing wave change phase.
A: Velocity you mean is the velocity of 2 travelling wave that combined to give standing wave
https://commons.wikimedia.org/wiki/File:Waventerference.gif#/media/File:Waventerference.gif
