It is native to North America, Mexico and Central America, and it is NOT venomous. The Red-bellied black snake (Pseudechis porphyriacus) is considerably larger, and can reach 1.5 to 2.5m in length. It is native to Eastern Australia and is venomous.
Emission of Light. An overview of light emission. Light can be produced by matter which is in an excited state and as it will be shown excitation can come from a variety of sources. The atoms and molecules that make up matter typically emit light at characteristic energies. The light emission can be spontaneous or stimulated.
Freebase(0.00 / 0 votes)Rate this definition: Thermionic emission. Thermionic emission is the heat-induced flow of charge carriers from a surface or over a potential-energy barrier. This occurs because the thermal energy given to the carrier overcomes the binding potential, also known as work function of the metal.