Question

problem 12 an artist who likes working with sources of light decides to make a sculpture out of electrified glass tubes that contain very thin (rarified) neon gas. when the sculpture is finished, and the electricity is turned on, the tubes glow with a rich red color. what we are seeing is a doppler shift. an emission spectrum. an absorption spectrum. all of these a continuous spectrum. submit hint i give up! 4 submission(s) remaining hints: 0% deduction per hint. hints remaining: 1 feedback: 0% deduction per feedback

Explanation:

When electricity is passed through rarefied neon gas in electrified glass tubes, electrons in the neon atoms move to higher - energy levels and then return to lower levels, emitting photons of specific wavelengths corresponding to the energy differences. This results in an emission spectrum, which is the characteristic set of wavelengths of light emitted by the gas. A Doppler shift is related to the motion of the source relative to the observer and is not relevant here. An absorption spectrum occurs when light passes through a substance and certain wavelengths are absorbed, which is not the case here. A continuous spectrum contains all wavelengths of light in a range, and this is not what is produced by the neon gas.

Answer:

an emission spectrum