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Light Bulb

  1. Nov 6, 2006 #1
    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 cant understand how to do it. I am a student of 9th standard.
  2. jcsd
  3. Nov 6, 2006 #2

    Andrew Mason

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

  4. Nov 7, 2006 #3
    No nothing at all!!!!!!!!!!!!!!!!!!! I have provided everything given at the question. If it isnt possible just tell me a way hot to prove that the given data is insufficient. :smile:
  5. Nov 7, 2006 #4


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

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