[SOLVED] Energy Density of Sunlight 1. The problem statement, all variables and given/known data Use the solar constant (1350 W/m^2) to calculate the energy density of sunlight at a)Earth and b) near the surface of the sun. 2. Relevant equations Stefan-Boltzman = (2pi^5)/(15(h^3)(c^2)) h=6.63x10^-34 j.s L(solar luminosity)=4pi(D^2)S S=1340 W/m^2 3. The attempt at a solution I don't know what I'm doing. I'm assuming those are the more important things to use. I'm getting frustrated with this and really need some help. I'm trying to plug in the power per area into the stefan boltzman eq to see if I can find the answer but it isn't working.