Problem # p025

Heat loss via radiation

We wish to determine the temperature of the surface of a medium strength incandescent, frosted light bulb. To this end we assume :

  1. The material of the bulb's surface radiates like a black body
    (Stefan-Boltzmann constant : σ=5.67*10-8 W/(m2 K4)

  2. We can neglect all other modes of energy loss except of course radiation

  3. The light bulb is a perfect sphere with a radius of R = 3.5 cm
    (surface of a sphere : 4*π R2)

  4. The light bulb is rated at 100 W