Physics

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
Staff Emeritus
Gold Member
Welcome to the Forums,

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

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?

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

Hootenanny
Staff Emeritus
Gold Member
Well you could start by writing down the Stephen-Boltzmann law and identifying what all the symbols mean...

Hootenanny
Staff Emeritus
Gold Member

Thanks, am a kind of confused.

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

Hootenanny
Staff Emeritus
Gold Member
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.

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
Staff Emeritus