are they

I'm not sure what you mean "made by". Photons can be emitted by electrons accelerating or changing energy levels in an atom. But they can also be created by any other charge being accelerated, or by nuclear fission or by many other processes.

No.

EDIT: Too late. My elaborated statement was in reply to the very detailed original question, of course. Not to Strange's post.

Edited February 23, 201411 yr by timo

No.

EDIT: Too late. My elaborated statement was in reply to the very detailed original question, of course. Not to Strange's post.

Funny. You were too late to write "No"?

Yes.

Are photons made by electrons only?

 

Definitely not.

Gamma photons can be result of annihilation of electron and positron, but also can be emitted by decaying nucleus (f.e. isomeric transition http://en.wikipedia.org/wiki/Nuclear_isomer ), or decaying pion 0 (for example).

 

a photon is a photon an electron is an electron