The Intensity of Sunlight Falling on the Earth Is About

Multiple Choice

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