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.
Most often, the emitted light has a lower energy (longer wavelength)than the absorbed light. So, most often any fluorescence we can see is produced by light withhigher energies (shorter wavelengths) than visible light. This shorter-wavelength light isultraviolet, the kind that causes sunburn.