(a) Find the magnitude of the momentum of a particle in a box in its nth state. (b) The minimum change in the particle's momentum that a measurement can cause corresponds to a change of +-1 in the qua? 
A) (a) (n * h) / (2 * L), (b) h / L 
B) (a) (n * h) / (4 * L), (b) h / (2 * L) 
C) (a) (n * h) / (2 * L), (b) h / (4 * L) 
D) (a) (n * h) / (L), (b) h / (2 * L)