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    Star's Temperature and Energy radiated by it

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    (a) A star's temperature is 6175 K. According to the Stefan-Boltzmann law, how much energy is radiated into space per second by each square meter of the star's surface ?
    1..... J

    (b) If the star's radius is 605,000 km, what is the total power output of the star?
    2 ...... W

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    Solution Preview

    According to the Stefan-Boltzmann law, The energy radiated by a blackbody radiator "per second per unit area" is proportional to the fourth power of the absolute temperature.

    Energy per area per second = sigma x T^4 Joules/m^2 s

    where sigma = 5.67 x 10^-8 W/m^2 ...

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