$($Intensity of the sun$)$ Problem $7.$ The intensity of light from the sun that is seen at the top of earth's atmosphere is $1366$ W$/$m$?.$ The distance between the earth and the sun is $1\mathrm{.}5$ x $1011$ m$.$ A$.$ Find the total power output of the sun. Express your answer in W and use scientific notation $($Ex$.$ write $6\mathrm{.}02$ x $1023$ as $6\mathrm{.}02$E$23).$ B$.$ What would the intensity be at Mercury $($whose orbital radius is $0\mathrm{.}387$ times that of the Earth$).$ Express your answer in units of W$/$m$?.$