We can reasonably model a 75 W incandescent lightbulb as a sphere 7.0 cm in diameter. Typically, only about 5.0 % of the energy goes to visible light; the rest goes largely to nonvisible infrared radiation. Required:
a. What is the visible light intensity (in W/m^2) at the surface of the bulb?
b. What are the amplitudes of the electric and magnetic fields at this surface, for a sinusoidal wave with this intensity?