An artist who likes working with sources of light decides to make a modern 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.

An emission-line spectrum.

Explanation:

The red color observed in the tubes is the emission spectrum of the neon gas, this emission is the energy an atom emits when going from an excited state to a lower one.

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explanation:

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the entire statement is true and correct.  

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