Answer
See work below.
Work Step by Step
a. The apparent brightness is the "solar constant" that is given in the problem.
b. Use equation 33–1 to calculate the intrinsic luminosity.
$$b=\frac{L}{4 \pi d^2}$$
$$L=4 \pi d^2 b$$
$$L=4 \pi (1.496\times10^{11}m)^2(1.3\times10^3W/m^2)$$
$$L=3.7\times10^{26}W$$
