Q: What colors in a neon sign represent real neon?


Read this paragraph and choose the correct option from the provided answers:

“Neon” signs are familiar examples of gas discharge tubes. However, only signs that glow with the red-orange color seen in the figure are actually filled with neon. Signs of other colors contain different gases or mixtures of gases.

 Choices:

- purple, blue

- blue, green

- yellow, white

- red, orange


A:
red, orange