Electromagnetic emission?

Question

Is a photon/electromagnetic wave emitted when a charge simply accelerates?

Answer 1

Yes...  unless that electron is accelerating with in an atomic orbit.

I believe it was Maxwell who stated that accelerated charges emit E-M radiation.  Reason:.... a charge has an E field around it.  If the charge accelerates, that E field will change.  A changing E field will INDUCE a B(magnetic) field.  This induced B field will also be changing... and a changing B field will induce another E field along in time and space.

This rate of INDUCTION has been measured to be equal to 'c'...  hence E-M radiation (which was later also called a photon, after the photoelectric effect)

Electrons orbiting in an orbit, although accelerated does not emit E-M radiation.  This violates the Classical Physics theory of E-M radiation.  Hence Bohr and DeBroglie used Quantum Physics to explain this phenomenon.  In orbit, electrons are no longer particles!!! They are actually WAVES!!!.. Matter waves!!!  : )

Answer 2

Yes.

In physics, emission is the process by which the energy of a photon is released by another entity, for example, by an atom whose electrons make a transition between two electronic energy levels. The emitted energy is in the form of a photon.

The emittance of an object quantifies how much light is emitted by it. This may be related to other properties of the object through the Stefan–Boltzmann law.

For most substances, the amount of emission varies with the temperature and the spectroscopic composition of the object, leading to the appearance of color temperature and emission lines. Precise measurements at many wavelengths allow the identification of a substance via emission spectroscopy.