A discrete emission spectrum is emitted by a (a) hot gas (b) cold gas (c) heated...
A discrete emission spectrum is emitted by a (a) hot gas (b) cold gas (c) heated solid metal (d) cold solid metal.
Homework Answers
(a) Hot gas.
an emission spectrum consists of bright lines or bands on a dark background. Emission spectra are produced when atoms of a dilute gas are `excited' -- in effect, heated -- by an electrical current, ultraviolet radiation, or some other source of energy. Excited atoms have electrons in high orbits, and these emit photons with specific wavelengths when they jump back down to lower orbits (as explained above). Neon signs produce emission spectra; so do objects like the Lagoon Nebula (M8) and the Ring Nebula (M57).
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