Black Body - 2 questions, help?

Question

1 - Define what is meant by a Black-body and provide a Black-body spectra for two objects:1 at temp T1 and the other at temp T2 where T1 > T2?
2 - A black-body spectrum is found to have a corresponding mean photon energy of 1,55eV.What is the temp of the object that gives rise to this black-body spectrum?

Answer 1

Look for that T^4 equation in the chapter you haven't read and plug and chug.