The sun delivers $10^{3} \,W m^{-2}$ of electromagnetic flux on the Earth's surface. The total power that is incident on a roof of dimensions $6 \,m \times 30 \,m$ is . . . . . . .
- A$7.2 \times 10^{5} \,W$
- B$4.5 \times 10^{5} \,W$
- C$1.8 \times 10^{5} \,W$
- D$0.9 \times 10^{5} \,W$
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