Fred's little brother Bobby is a real pain in the neck. He is always talking -- about baseball, comic books, Egyptian antiquities, flavors of ice cream -- he just won't be quiet. Fred decides to make the best of a bad situation: he builds a device to harness the power of Bobby's voice. A very thin panel 1 meter on a side converts the energy of the sound waves coming out of Bobby's mouth into electricity.
Q: Assume that Bobby talks at an ordinary volume, so the sound waves have a pressure amplitude of 2.5 x 10^(-2) pascals. Estimate the power this device will produce. Q: Could it light an ordinary bulb? Q: Fred builds a solar panel which is also 1 meter on a side and places it outside on a sunny day. Roughly how much power does this panel produce?