why we use tongstone in electrical bulbs?
why we use tongstone in electrical bulbs?
rakesh sreeramula , 15 Years ago
Grade 11
Physical Chemistry> bulb...
2 Answers
SAGAR SINGH - IIT DELHI
Dear rakesh,
The spectrum emitted by a black body radiator does not match the sensitivity characteristics of the human eye. Tungsten filaments radiate mostly infrared radiation at temperatures where they remain solid.
No known material can be used as a filament at this ideal temperature, which is hotter than the sun's surface. An upper limit for incandescent lamp luminous efficacy is around 52 lumens per watt, the theoretical value emitted by tungsten at its melting point.
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Sagar Singh
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Aniket Patra
Because of high resistace and high melting point.
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