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QUESTION
Use Stefan's law (, where is the temperature in kelvins) to calculate how much less energy (as a fraction) is emitted per unit area of a 4500-...
Use Stefan's law (, where is the temperature in kelvins) to calculate how much less energy (as a fraction) is emitted per unit area of a 4500- sunspot than from the surrounding 5800- photosphere. (Sec. 3.4 in the textbook)
