Why is ψ all over the place but E=h.f take on discrete values?
ψ is measured as energy density (Jm-3). It is a standing wave wrap around the center of the particle. That is why it is all over the place. As a wave it can superimpose and create a bigger wave. Many ψ waves of the same type sum to create particle clouds. Earth itself is one big g− particle, that is the superposition of many ψs from many g− particles.
Numerically ψ equals the Newtonian force. It is expected that under equilibrium when all forces sum to zero, that ψ of a particle is equal to the ψ of its neighboring particles. As a wave, the frequency, f of ψ, measures its energy. This is consistent with Planck equation,
E=h.f
Planck equation, provides energy information of a particle as a whole. As a complete wave around the particle, ψ can only take on certain frequencies such that the wave are of integer multiple of wavelengths on the perimeter of a circle, center at the particle.
n.λψ=2πaψ
and
n.λψmc=2πaψmc=h.f=E
for n=0,1,2,3...
It is expected that as E changes, ψ around the particle changes correspondingly, given the total volume of ψ. The energy of ψ, E takes on discrete values.
ψ itself is all over the place.