If a particle is confined to a three-dimensional, cubical region of length L on each side:
(a) The particle has a minimum uncertainty in each component of momentum of about h/(πL).
(b) The particle cannot have a wavelength less than 2L.
(c) The components of the particle's momentum in the y-and z directions can be determined exactly as long as there is a finite uncertainty in the x-component of momentum.
(d) The particle's kinetic energy has an upper limit but no lower limit.