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Grade 109 grade science

Why does gases inside tube lights glow when electric current is passed through it?

Profile image of Rahul Jiji George
11 Years agoGrade 10
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4 Answers

Profile image of Yugabrat Gogoi
11 Years ago
it gets heated up and then it start glowing.
Profile image of Yugabrat Gogoi
ApprovedApproved Tutor Answer11 Years ago
a tube light contains mainly fluorescent .
 
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 excited mercury vapour which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the bulb to glow. A fluorescent lamp converts electrical energy into useful light much more efficiently than incandescent lamps.The luminous efficacy of a fluorescent light bulb can exceed 100 lumen per watt, several times the efficacy of an incandescent bulb with comparable light output.
Profile image of Yugabrat Gogoi
11 Years ago
a tube light contains mainly fluorescent .
 
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 excited mercury vapour which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the bulb to glow. A fluorescent lamp converts electrical energy into useful light much more efficiently than incandescent lamps.The luminous efficacy of a fluorescent light bulb can exceed 100 lumen per watt, several times the efficacy of an incandescent bulb with comparable light output.
Profile image of Yugabrat Gogoi
11 Years ago
a tube light contains mainly fluorescent .
 
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 excited mercury vapour which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the bulb to glow. A fluorescent lamp converts electrical energy into useful light much more efficiently than incandescent lamps.The luminous efficacy of a fluorescent light bulb can exceed 100 lumen per watt, several times the efficacy of an incandescent bulb with comparable light output.

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