Answer the following question: Answer the following question given this paragraph: A neon light produces visible light by electroluminescence. In this process, neon or some other gas gives off light when an electric current passes through it. Other halogen gases besides neonincluding krypton and argonalso produce light in this way. The word "OPEN" in the sign below is a neon light. It is a long glass tube that contains neon gas. When electricity passes through the gas, it excites electrons of neon atoms, and the electrons jump to a higher energy level. As the excited electrons return to their original energy level, they give off visible light. Neon produces red light. Other gases produce light of different colors. For example, krypton produces violet light, and argon produces blue light. Q: Neon, krypton and argon are examples of what kind of gases, which produce light by electroluminescence? A:

Select from the following. a. radiation gases; b. ionic gases; c. irradiation gases; d. halogen gases;
Answer:
d.