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Given that the radius of Earth is 6.37 x 106 m and the average distance from...

Given that the radius of Earth is 6.37 x 106 m and the average distance from the Sun to the Earth is 1.50 x 108 km:

  1. (a) What fraction of the radiation emitted by the Sun in intercepted by the Earth?

  2. (b) A satellite in Earth orbit measures an intensity of 1350 W/m2 (this is a standard used in satellite construction: “AM0”), what is the total power output of the Sun based on our near- Earth satellite measurements?

(c) Measured from Earth’s surface the Sun’s intensity is only 1000 W/m2 due to some light being absorbed by the atmosphere (this standard is called “AM1.5” for solar cell construction among other applications). How much power could we generate on Earth if we covered the entire planet surface in 100% efficient solar cells? Compare this to the International Energy Agency’s 2013 global energy consumption estimate of 1.5 x 1017 Watt-hours.

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