where 
is the magnitude of the momentum of the particle and 
is Planck's constant. [P10.2, P11.1, P11.2]
of: a particle or, more generally, of a free quantum
is given: by where is the magnitude of the momentum of the particle and is Planck's constant. [P10.2, P11.1, P11.2]
determines: the diffraction when the quantum meets an obstacle. [P11.1, P11.2]
Copyright 1997, The Open University