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.
An emission line spectrum can only be produced by a hot, tenuous (low-density) gas. Importantly, the wavelengths of the emission lines depend on the type of gas; e.g., Hydrogen gas produces different emission lines than Helium. Absorption lines can be best thought of as the opposite of emission lines. While an emission line adds light of a particular wavelength, an absorption line subtracts light of a particular wavelength. Again opposite of emission lines, absorption lines are produced by a cool gas. Naturally there must be some light to subtract, so absorption lines can only be seen when superimposed onto a continuum spectrum. Thus, for absorption lines to be seen, cool gas must lie between the viewer and a hot source (case âcâ).