Editor
Value of solar constant at the Earth's atmosphere is
Difficulty: Easy
A: 
1 $\rm{kWm^{-2}}$
B: 
1.38 $\rm{kWm^{-2}}$
C: 
2 $\rm{kWm^{-2}}$
D: 
2.8 $\rm{kWm^{-2}}$
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