Which of the following gases can be used to make neon signs?
(i) Neon (ii) Argon
(iii) Krypton

Options

A. `(i),(ii),(iii)`
B. `(i)`
C. `(i),(ii)`
D. `(i),(iii)`

Answer

A

Explanation

The familiaer neon signs we see on store fronts are colored by the atomic emission phenomenon. Excited neon atoms release orange-red light. Other gases may also be used to make ''neon'' signs. For example, argon emits a bluish purple light and krypton gives off white light. special fluorescent materials on the inner glass walls of sign produce green and other colours as well.