Calculating Solar Energy at Earth's Distance from the Sun

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To calculate the solar energy incident on Earth, one must consider the power output of the Sun, which is 4 x 10^26 watts, and the distance from the Earth to the Sun, approximately 1.5 x 10^11 meters. The energy spreads over the surface area of a sphere with radius equal to the distance from the Sun. By calculating the surface area of this sphere, one can determine the power per square meter received at Earth's distance. Understanding this relationship allows for the derivation of an expression governing the rate of solar energy incident upon Earth. This approach provides a foundational method for analyzing solar energy impact.
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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
 
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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
 

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