The electrons also emit X-rays and heat the ambient plasma.

When it drops down, the electron emits a unit of radiation, called a photon.

So, does an electron emit electro-magnetic radiation when it is moving at a constant velocity, and in a straight line?

- no electron emits any photon if it is alone and undisturbed.

The excited electrons would fall back to their original levels and emit energy as light.

An electron must absorb or emit specific amounts of energy for transition between these fixed orbits.

If everything goes right, the electrons emit light in a coherent manner.

A clumping of the waves here means this is the most likely place to find that traveling electron emitted from over there.

Usually the electron emits many photons, and each has an energy less than 60 keV.

For example, an electron around an atom does not emit radiation in the pattern predicted by these classical equations.