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| Q. |
The coloured discharge tubes for advertisement mainly contain - |
| A. | Xenon |
| B. | Argon |
| C. | Helium |
| D. | Neon |
| Answer» D. Neon | |
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Explanation: Neon gives a distinct reddish- orange glow when used in either low-voltage neon glow lamps or in highvoltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses. |
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