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The energy flux of solar radiation arriving at Earth orbit is 1353 W/m2. The diameter of...

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Mechanical Engineering

The energy flux of solar radiation arriving at Earth orbit is1353 W/m2. The diameter of the sun is 1.39x109 m and the diameterof the Earth is 1.29x107 The distance between the sun and Earth is1.5x1011 m.

(a) What is the emissive power of the sun as calculated from theparameters given above?

(b) Approximating the sun’s surface as black, what is itstemperature (as calculated from the parameters given above)?

(c) At what wavelength is the spectral emissive power of the suna maximum?

(d) Assuming the Earth’s surface to be black and the sun to bethe only source of energy for the earth, estimate the Earth’ssurface temperature. Assume that the Earth absorbtivity to solarirradiation is 0.7. The actual average temperature of the Earth iscurrently ~288 K. Why do you think there are differences betweenyour prediction and the actual average temperature (assume that thegiven value of absorbtivity is correct)?

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