Question
The intensity of electromagnetic waves from the Sun at the Earth is $1400 \mathrm{~W} / \mathrm{m}^{2}$. How much power does the Sun generate? The distance from the Earth to the Sun is $149.6 \cdot 10^{6} \mathrm{~km}$.a) $1.21 \cdot 10^{20} \mathrm{~W}$b) $2.43 \cdot 10^{24} \mathrm{~W}$c) $3.94 \cdot 10^{26} \mathrm{~W}$d) $2.11 \cdot 10^{28} \mathrm{~W}$e) $9.11 \cdot 10^{30} \mathrm{~W}$
Step 1
In this case, the cross-sectional area is the surface area of a sphere with radius equal to the distance from the Earth to the Sun. The formula for the surface area of a sphere is $4\pi r^{2}$, where r is the radius of the sphere. Show more…
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