Bill, thanks for your reply. Sadly I didn't find the answer in QED but I learned something new :). What I mean with the bike story is: There is a discrete nature in the way a photon is created when an electron that is bound to an atom move from a higher energylevel to a lower one. I do not see...
Is it true that the energy in electromagnetic waves can only be released in "packets" of energy?
Or is this only the case for a system where a standing wave change from one mode to another which results in sending out an electromagnetic wave (photon).
In other words if I ride on my bike...