So the energy of a EM wave is depends on the energy of a single proton, and the amplitude of the electric field is depends on how many proton in the same energy state?
we have just studied a little of the wave in the syllabus, so how to distinduish the classical EM wave and the single-photon state? And so for the example of gamma ray, which of the two equations can be applied? Since we have confused E = hv with E α A^2 in the example of gamma ray.
My teacher told us energy at a point of a progressive wave is proportional to square of amplitude, it is true for both mechanical and electromagnetic wave.
But in the other lesson, he also tols us the energy of the EM wave is equal to hv, where h = Planck constant, v = frequency of the wave...
Actually, I am now studying the A-Level in Hong Kong. My teacher told me that when damping exists, amplitude keeps constant at steady state because the input energy will lose due to damping force.I can understand this.
But I cannot understand why the amplitude still be constant when no damping...
So, the situation is the vibrating frequengy is equal to the driving frequency, but it still has a phase difference so the energy cannot completely transfer to the object?
But i still cannot understand where the input energy has gone?(I am so stupid and bad at English)
Thank you very much for your detailed solution.
So, if the resonance does not occur but it is still no damping force present, is the energy transfers back to the external agent or transfers to other position in a different state(PE, heat etc.)?
I have a question about resonance.
According to this graph, http://en.wikipedia.org/wiki/File:Resonance.PNG
When no damping force (the red line), there should be no energy loss due to frictional force or other damping force. So the energy should be fully transferd to the system from the...