Over 90 percent of the energy dissipated by an incandescent light bulb is in the form of heat, not light. What is the temperature of a vacuum- enclosed tungsten filament with an exposed surface area of 2.03cm in a 100W incandescent light bulb? The emissivity of tungsten at the anticipated high temperatures is about 0.35. Note that the light bulb consumes 100W of electrical energy, and dissipates all of it by radiation (a) 1870 K (b) 2230 K (c) 2640 K (d) 3120 K (e) 2980 K