Question: The surface of the Sun has a temperature of 5500 C. (a) Treating the Sun as a perfect blackbody, with an emissivity of 1.0, find

The surface of the Sun has a temperature of 5500 °C.

(a) Treating the Sun as a perfect blackbody, with an emissivity of 1.0, find the power that it radiates into space. The radius of the Sun is 7.0 × 108 m, and the temperature of space can be taken to be 3.0 K.

(b) The solar constant is the number of watts of sunlight power falling on a square meter of the Earth's upper atmosphere. Use your result from part (a) to calculate the solar constant, given that the distance from the Sun to the Earth is 1.5 × 1011 m.

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