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rakesh sreeramula Grade: 11
        

why we use tongstone in electrical bulbs?

6 years ago

Answers : (2)

SAGAR SINGH - IIT DELHI
879 Points
										

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


B.Tech IIT Delhi


sagarsingh24.iitd@gmail.com



 

6 years ago
Aniket Patra
48 Points
										

Because of high resistace and high melting point.

6 years ago
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