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why we use tongstone in electrical bulbs?
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.
We are all IITians and here to help you in your IIT JEE preparation. All the best. If you like this answer please approve it.... win exciting gifts by answering the questions on Discussion Forum Sagar Singh B.Tech IIT Delhi sagarsingh24.iitd@gmail.com
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If you like this answer please approve it....
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Sagar Singh
B.Tech IIT Delhi
sagarsingh24.iitd@gmail.com
Because of high resistace and high melting point.
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