Recent content by huhuayu

Personally I think trying to work out new concepts and describe them is a great process of physics,so I think the question "How big a photon is" is meaningful,although there is some difficulty to answer it. We don't always resort to analogy to understand new things,even in classical...

In atomic fission,a heavy nucleus splits into fragments and emits energy in different forms, for example photons. Do these photons have the same frequency, phase and direction? I don't know much about nuclear physics,could you please tell me?Thanks.

I think the "particle" Feynman means is not a classical particle.If we use Feymann's theory to explain all,a classical particle do also have infinite paths to go from A to B,and each path has a complex amplitude.But different from the quantuam world,the amplitudes vary so fast that at last only...

Excuse me.But I can't understand. In experiments, such as the single-atom two-slits interference, the photon behaves like a particle,traveling through the slits and touching the screen.The retardation time of photon traveling can be measured in some other experiments.Why you consider them as...

Is QED a superior theory to quantum mechanics? Forgive my ignorance, but I think QED itself(the annihilation operator, the Lagrange and so on) is hard to get the scene of electrons jumping between bound state. Is it true?