Read the passage - Then select the valid inference
The term "neon light was originally applied to as particular types of Vapor lamp using
the inert, colorless gas noon. Along tube was filled with neon, which then became
luminous at low pressure when an electric current was passed through it. The lamp
then emitted the characteristic reddish-orange light of neon. Today, the term "neon
light is given to lamps of this general type which may be filled with a variety of
gases, depending on the color that is desired. Argon, for example, is used to
Y
a
sve sases, depending o
produce blue light. Colors can also be altered by changing the color of the glass
tube. The tubes must be quite long in all these lamps to produce light efficiently. As
a result, high voltages are required. Neon tube lamps are not practical for indoor
Through this site u
illumination, but they have found widespread outdoor use in glowing, colorful
advertising signs. (choose only one answer)
b) The meaning of the term "neon light" has
changed over time.