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The Temperature of the Sun at Its Surface Is 5800 σ\sigma

Question 61

Multiple Choice

The temperature of the Sun at its surface is 5800 K and has a power output of 4.0·1026 W.Estimate the Sun's current surface area.Assume the Sun is a perfect blackbody with emissivity = 1.(The Stefan-Boltzmann constant is σ\sigma = 5.67 * 10-8 W/m2K2.)


A) 2.5 * 1018 m2
B) 4.2 * 1018 m2
C) 4.5 * 1017 m2
D) 6.2 * 1018 m2
E) 7.5 * 1017 m2

Correct Answer:

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