A) Sodium vapour and neon
B) Sodium oxide and argon
C) Mercury vapour and argon
D) Mercury oxide and neon
Correct Answer: C
Solution :[c] A fluorescent lamp or a fluorescent tube is a low pressure mercury-vapour gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapour which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow. A fluorescent lamp converts electrical energy into useful light much more efficiently than incandescent lamps.
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