1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    User Avatar
    Science Advisor
    Homework Helper

    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


    User Avatar
    Science Advisor
    Homework Helper

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

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook