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...
Since the energy given off is strongly restricted to quanta, and quanta that allow the electron to move to a suitable place within the atom, the photons of light are similarly restricted to a tiny range of values of wavelength and frequency (a property we see as color).