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

question 46

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 $\sigma$ = 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

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