Question : A fluorescent tube contains__________.
Option 1: Argon vapour
Option 2: Mercury vapour
Option 3: Sodium vapour
Option 4: Neon vapour
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Correct Answer: Mercury vapour
Solution : The correct option is Mercury vapour .
A small mercury vapour can be found in a standard fluorescent tube. UV light is produced by the Mercury vapour when power is introduced. A Phosphorescent coating within the tube reacts with the UV light, allowing it to glow and emit visible light. This technique is what creates the distinctive glow of fluorescent tubes.
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