Electron jump and the photon freq

[zrek]

I found the explanation of the radiation here, in the document of the Purcell Simplified:
http://physics.weber.edu/schroeder/mrr/MRRtalk.html

I like it, however I'm ucertain how to fit this to the light, as photon.

Am I thinking correctly, that this figure fits also the case when a photon is emitted by an atom?
I assumed that the "jump" in the center may be a jump of the electron in an atom, so the radiation is the light.
In this case how can I calculate the frequency of the light (the energy of the photon)?
Can it be calculated from the size of the jump? Is there a formula for it?

Thank you!

 

[mfb]

In this case how can I calculate the frequency of the light (the energy of the photon)?

It is not a single photon, and often not even a well-defined number of photons. You can calculate the frequency spectrum of the emitted radiation, however. This should work with a Fourier transformation but it is significantly below the level of such a sketch.