Solar energy equation

1. Feb 8, 2012

ldkz2524

i have to come up with expression that governs the rate of solar energy incident upon the earth with radius of Earth, Re, power output of Sun 4*10^26 and distance from Earth to Sun as 1.5*10^11. But i have no idea how to get the expression HELP

2. Feb 8, 2012

technician

The energy from the Sun is passing through the surface of a sphere of radius R, where R is the distance FROM the SUN.
If you know how to calculate the surface area of a sphere then you should be able to calculate the power per square metre at the Earth's distance from the Sun.
Hope this helps