# Calculating the amount of heat energy radiated by sun

How do I calaculate the amount of heat energy radiated from the sun in one minute?? Well, i tried some stefan method, but the answer seems far off from the correct one....well, i would thus strongly want to have some help in this regard..

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Can you please expand on your question: How exactly have you used the "stefan method" (I suppose you refer to the Stefan-Boltzmann law?)? – Lagerbaer Mar 20 '13 at 0:38
And what makes you think you have the wrong answer? Do you have a good feel for what the scale of the answer should be? – dmckee Mar 20 '13 at 0:54
@lagerbaer.. i m not sure whether i had chosen the right method..but i only thought that probably that one would do... – idiosincrasia23 Mar 20 '13 at 1:05
You say you "tried some stefan method" - what specifically did you try? Can you provide us with some of your work? – Shivam Sarodia Mar 20 '13 at 1:25
You should put your work, including numbers, in the question for homework problems, so that people know what the issue is. – DilithiumMatrix Mar 20 '13 at 1:47

## 1 Answer

You should be able to show us how you have tried to answer the question, but you sound genuinely desparate. Is this the way you tried to answer your question? Check your method with this one.

You have the following data: (see if you can find more accurate ones)

Surface temperature of the sun, $T = 5,800$K

Radius of the sun, $R=6.995\times 10^8$m

Stefan's constant,$\sigma = 5.670\times 10^{-8}$Wm$^{-2}$K$^{-4}$

The equation for the thermal energy per second (that is Power) radiated by the sun is

$P= 4\pi R^2\sigma T^4$.

So if you put the data in you should find

$P=3.95\times 10^{26}$W

To find the amount of energy emitted in one minute you must multiply by 60, so you get

$E=2.37\times10^{28}$J.

Do the calculations yourself using the calculator carefully.

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thank u for your help. – idiosincrasia23 Mar 20 '13 at 9:02