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Title: Calculate the average power radiated by each square meter of the Sun's surface. Post by: astronut77 on Oct 12, 2013 The Sun radiates a total power of about 4×1026 watts into space. The Sun's radius is about 7×108 meters.
A.) Calculate the average power radiated by each square meter of the Sun's surface. (Hint: The formula for the surface area of a sphere is A=4πr2.) a. ≈2×108Wm2 b. ≈2×1045Wm2 c. ≈5×1016Wm2 d. ≈6×107Wm2 B.) Using your answer from part A and the Stefan-Boltzmann law, calculate the average surface temperature of the Sun. (Note: The temperature calculated this way is called the Sun's effective temperature.) a. ≈6,000K b. ≈1,000K c. ≈1015K d. ≈10,000K Title: Re: Calculate the average power radiated by each square meter of the Sun's surface. Post by: padre on Oct 15, 2013 HI astronut77,
I tried looking up the answers to these question, but no luck. Did you end up finding the answers to them? I'd like to know what you got, if that's OK. Title: Re: Calculate the average power radiated by each square meter of the Sun's surface. Post by: connorp on Oct 15, 2013 I get D for number one. You take the total wattage emitted (4x10^26w) and divide by the surface area (4π(7x10^8)^2 m^2) and end up with 6.49612x10^7 w/m^2.
Don't know how to do number two, but the Sun's effective temperature is 5780K, so A for that one. Title: Re: Calculate the average power radiated by each square meter of the Sun's surface. Post by: padre on Oct 15, 2013 Thanks Connor
Title: Re: Calculate the average power radiated by each square meter of the Sun's surface. Post by: connorp on Oct 15, 2013 No problem.
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