An Artist Who Likes Working with Sources of Light Decides

Multiple Choice

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:

A) a continuous spectrum
B) an absorption spectrum
C) an emission spectrum
D) a Doppler shift
E) all of the above