Question

We can reasonably model a 40 W incandescent lightbulb as a sphere 5.0 cm in diameter. Typically, only about 5.0 % of the energy goes to visible light; the rest goes largely to nonvisible infrared radiation.

What is the visible light intensity (in W/m2) at the surface of the bulb? Express your answer in watts per meter squared.

What is the amplitude of the electric field at this surface, for a sinusoidal wave with this intensity? Express your answer with the appropriate units.

What is the amplitude of the magnetic field at this surface, for a sinusoidal wave with this intensity? Express your answer using two significant figures.

Answer 1

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