The electromagnetic flux from the sun reaching the earth is $10^3 \, W/m^2$. The power incident on a roof of dimensions $8 \, m \times 20 \, m$ is ..... $W$.
- A$2.56 \times 10^4$
- B$6.4 \times 10^5$
- C$4.0 \times 10^5$
- D$1.6 \times 10^5$
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