## College Physics (4th Edition)

The plane radiates energy in the form of sound waves at a rate of $3.1\times 10^4~W$
We can find the rate that the plane radiates energy in the form of sound waves: $I = \frac{P}{A}$ $P = I~A$ $P = I~(4\pi~r^2)$ $P = (1.0\times 10^2~W/m^2)~(4\pi)~(5.0~m)^2$ $P = 3.1\times 10^4~W$ The plane radiates energy in the form of sound waves at a rate of $3.1\times 10^4~W$