They say that these extra dimensions are so small that we don't experience them. So what is the dividing line (in terms of size) between what makes a particle stop interacting with the extra dimensions; in other terms, how much smaller is a string than a quark? Can anyone put that into perspective? What would that look like?
I was wondering how big the strings are because I wanted to know if they are smaller than the Plank Length. If they are then would that mean that the extra dimensions can only exist for lengths less than the Plank Length?