For me, plane waves as free particles are the 'elementary particles' of quantum mechanics. From them one can build more localized particles like wave packets and delta functions. The energy (E = h . f) of a free particle is well-defined because it only has 1 frequency. The price we pay for that is that it is completely delocalized.
For me, plane waves as free particles are the 'elementary particles' of quantum mechanics. From them one can build more localized particles like wave packets and delta functions. The energy (E = h . f) of a free particle is well-defined because it only has 1 frequency. The price we pay for that is that it is completely delocalized.
Particles are just goofy.