Intensity: The average intensity of sunlight impinging on Earth is measured to be about 1.4 kW/m2. What is the power of sunlight emitted by the sun? (Earth-Sun distance = 1.5 × 108 km, Earth 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
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