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

question 32

Multiple Choice

The temperature of the Sun at its surface is 5800 K and has a radius of 7.0 * 10⁸ m.Estimate the Sun's current power output.Assume the Sun is a perfect blackbody with emissivity = 1.(The Stefan-Boltzmann constant is $\sigma$ = 5.67 *10^-8 W/m²K².)

• A)4.0·10²⁶ W
• B)4.0·10²⁶ W.
• C)3.2·10²⁶ W
• D)2.0·10²³ W
• E)6.2·10²⁶ W

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