The intensity of sunlight falling on the earth is about 1.4 kW/m2 (before any gets absorbed by our atmosphere). At what rate does the sun emit light energy?

(The earth-sun distance = 1.5 × 108 km and the earth's radius = 6.4 × 103 km.)
A) 4.0 × 1026 W
B) 3.2 × 1022 W
C) 7.2 × 1014 W
D) 7.6 × 108 W


Answer: A

Physics & Space Science

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