## College Physics (4th Edition)

The sun emits electromagnetic waves at a rate of $4.0\times 10^{26}~W$
We can find the rate at which the sun emits electromagnetic waves: $I = \frac{P}{A}$ $P = I~A$ $P = I~(4\pi~r^2)$ $P = (1.4\times 10^3~W/m^2)~(4\pi)~(1.5\times 10^{11}~m)^2$ $P = 4.0\times 10^{26}~W$ The sun emits electromagnetic waves at a rate of $4.0\times 10^{26}~W$