> If it is Planck length what is meant by shortest possible wavelength
No. Planck mass, for instance, is certainly not the smallest possible mass: 10^-8 kg.
> Wikipedia says "... it would become impossible to determine the > difference between two locations less than one Planck length apart."http://en.wikipedia.org/wiki/Planck_length > It doesn't read like there is no difference, it just cannot be > determined.
How should there be a difference if it cannot be determined, even in priciple by reality itself?