A) Mercuric oxide and neon
B) Sodium vapour
C) Mercury vapour and an inert gas
D) Argon at low pressure
Correct Answer: C
Solution :[c] The central element in a fluorescent lamp is a sealed glass tube. The tube contains a small bit of mercury and an inert gas, typically argon, kept under very low pressure. The tube also contains a phosphor powder, coated along the inside of the glass. The tube has two electrodes, one at each end, which are wired to an electrical circuit.
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