These levels have well defined energies and electrons moving between them must absorb or emit an energy equal to the difference between them.

A radionuclide is an atom with an unstable nucleus which, to become more stable, emits energy in the form of rays or high speed particles.

The windings in the transponder chip absorb that energy and power the electronic chip to emit a signal.

Unlike burning fossil fuels, geothermal energy emits no greenhouse gases, pollution or hazardous wastes.

Although the energy does emit light photons when annihilated, it is converted from some form of energy that has not been named.

The energy emitted at the disk surface is in form of electromagnetic radiation.

The energy emitted per unit length travelled by the particle per unit of angular frequency is:

In each case, the energy emitted as photons by the initial avalanche is used to ionise a nearby gas molecule creating another accelerable electron.

Due to geometric spreading, energy emitted uniformly will spread over a sphere of increasing surface area.

Now admittedly nuclear energy does not emit any harmful substances nor produce any CO2 exhaust.