Anderson localization - waves experiment

[saadsarfraz]

I was doing this experiment with the setup which as follows. You have long aluminium bar which as 28 masses attached to bar evenly. The bar is vibrated at several different frequencies and we see a bunch of normal modes at particular frequencies. the collection of normal modes is called a band i can see the band gaps. my question is how do i find the fundamental frequency of this system? is there a mathematical formula to do this??

 

[Andy Resnick]

I don't understand what this has to do with Anderson localization.