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

question 41

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 radius.Assume the Sun is a perfect blackbody with emissivity = 1.(The Stefan-Boltzmann constant is $\sigma$ = 5.67 * 10^-8 W/m²K².)

• A)6.6 * 10⁸ m
• B)6.2 * 10⁸ m
• C)8.9 * 10⁸ m
• D)2.5 * 10⁹ m
• E)7.0 * 10⁸ m

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