Please help with this Physics question?

[Yarka]

If a star has a surface temperature of 1000 degrees Kelvin and emits 500,000 watts of each square-meter of surface area, how much power does each square-meter of its surface area emit after it has cooled to 900 degrees Kelvin?

[Hootenanny]

Welcome to the Forums,

Have you any thoughts on the question? Which law do you think we should use?

[Yarka]

If a star has a surface temperature of 1000 degrees Kelvin and emits 500,000 watts of each square-meter of surface area, how much power does each square-meter of its surface area emit after it has cooled to 900 degrees Kelvin?

[Yarka]

Stephen-Boltzmann's Law i guess, but i couldn't figure out how? plz help if u have any idea

[Hootenanny]

Well you could start by writing down the Stephen-Boltzmann law and identifying what all the symbols mean...

[Hootenanny]

Double posting isn't going to get your thread answered any quicker, I've already answered your other thread.

[Yarka]

Thanks, am a kind of confused.

[Yarka]

it may be easy for u to answer, so plz help me?

[Hootenanny]

it may be easy for u to answer, so plz help me?
I am trying to help you. The guidelines here at PF prevent us from providing solutions to problems, they also require that you show your efforts and that we guide you through the problem rather than just handing you the solution on a plate.

[Yarka]

ok. this is what i have= v/t=pi*P*D^4/128*L*Visc.

so 500,000=3.14*100*1000/128*L
Am i right?

[ZapperZ]

Two different threads have been merged because the OP made multiple postings.

Zz.