Discussion
Solar constant is :
Answer: B
The solar constant is 1345 W/M2 in this paper's figure.
The solar constant is the solar energy received per unit time on a unit area held perpendicular to the sun's rays at the mean Earth-sun distance, outside the atmosphere. Because it is a flux, its unit is watts per square metre. Older textbooks quote values between about 1340 and 1370 W/m2; current satellite measurements put it near 1361 W/m2, so 1345 is the textbook value the paper uses.
The options in W/M have the wrong unit for a flux. 1200 W/M2 is too low, and 345 is closer to the average solar input over the whole globe (about a quarter of the solar constant), not the solar constant itself.
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