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Which gas is commonly used in fluorescent lamps?
Neon
Argon
Helium
Radon
Argon
Argon gas is commonly used in fluorescent lamps along with a small amount of mercury vapor. It serves as an inert filler gas that facilitates the electrical discharge and protects the internal electrodes from degradation.
Argon gas is commonly used in fluorescent lamps along with a small amount of mercury vapor. It serves as an inert filler gas that facilitates the electrical discharge and protects the internal electrodes from degradation.
Think of argon as the safe medium that lets the electrical current travel smoothly across the room, much like air allows sound waves to travel from a speaker to your ears.
Hg+eтИТтЖТHgтИЧ+eтИТ тАФ Excitation of mercury vapor by electron collision
When voltage is applied, electrons flow through the argon gas, ionizing it and striking mercury atoms to excite them. The excited mercury atoms release ultraviolet radiation, which the phosphor coating converts into visible light.
Argon is an inexpensive, chemically inert noble gas.
It helps lower the ignition voltage required to start the lamp.
It prevents the rapid evaporation and sputtering of the tungsten electrodes.
Extends lamp life by reducing electrode wear
Improves starting reliability in cold conditions
Requires toxic mercury vapor to function for lighting purposes
Fluorescent tube lights
Compact fluorescent lamps (CFLs)
High-intensity discharge lamps
Argon is the third-most abundant gas in the Earth's atmosphere.
Option A (Neon) produces a reddish-orange glow and is used in neon signs. Option C (Helium) has unsuitable electrical breakdown characteristics. Option D (Radon) is radioactive and highly unstable.
B is correct тАФ Argon is used as the standard inert filler gas in fluorescent lamps to assist in starting the electrical arc and protecting electrodes.
Questions frequently test the properties of noble gases, especially their inertness and use in lighting, welding, and protective atmospheres.
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