Calculating Wattage of a Light Bulb in a Soot-Covered Room

[ritwik06]

A light bulb is completely covered with a thin coat of black soot in a room maintained at 20 degree celsius. If the shell has an equilibrium temperature of 100 degree celsius. What is the wattage of the bulb?

I can't understand how to do it. I am a student of 9th standard.

 

[Andrew Mason]

A light bulb is completely covered with a thin coat of black soot in a room maintained at 20 degree celsius. If the shell has an equilibrium temperature of 100 degree celsius. What is the wattage of the bulb?

I can't understand how to do it. I am a student of 9th standard.

Do they give you the radius or area of the lightbulb?

AM

 

[ritwik06]

Do they give you the radius or area of the lightbulb?

AM

No nothing at all! I have provided everything given at the question. If it isn't possible just tell me a way hot to prove that the given data is insufficient.

 

[OlderDan]

No nothing at all! I have provided everything given at the question. If it isn't possible just tell me a way hot to prove that the given data is insufficient.

This should give you what you need. The size of the bulb does matter.

http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan.html#c1