1 Common rashes include eczema, poison ivy, hives, and athlete's foot. 2  Infections that cause rashes may be fungal, bacterial, parasitic, or viral.  Over-the-counter products may be helpful treatments for many skin rashes.
The conditions under which this process occurs happen in two ways. According to the Cornell Center for... Atoms emit a photon when an electron falls from a high-energy state to a low-energy state. The conditions under which this process occurs happen in two ways. According to the Cornell Center for...
The amount of energy an atom can absorb depends on the energy separation of the electronic levels of the atom. If light of frequency, (, is incident on the atom, the atom will absorb this light only if the energy of a photon of this light () equals the energy difference between two electronic levels of the atom.