ABSTRACT
The total energy of a particle (e.g., an electron in an atom, a free electron, an electron in an electric field, a conduction electron in a solid) is the sum of the
V m
p E
Vpv
VmvE
potential and kinetic energies. Expressed in terms of momentum p, and mass m, this is stated:
mvp since
hfE
h
k
f
Considering movement in one dimension only,
let
t iE
x ip
i2 = 1 Now, the potential energy, V, may depend upon the position and time, and so in general, V = V(x,t).