Excitation vs. Emission
What is Excitation?
There are two meanings of the word excitation. The first one is technical. In Physics, the process of applying energy to a particle or a substance so as to trigger excitement and resulting in the alteration of its state especially from a low energy state to a higher energy state is referred to as excitation.
In Physiology, excitation is the process of using stimulation to create activity within an organ or tissue for example within a nerve cell.
What is Emission?
In Physics, emission is the discharge of electrons by a cathode or an electron gun. The electrons are also referred to as emissions.
Emission could also refer to the discharge of substance as a result of excitation for example factory emissions of smoke are as a result of burning matter.