Answer Happy

I need only part 4 please!!!!!!
Problem 3: Black body according to Bose-Einstein statistics The black body can be thought of as a box with a volume V and a temperature T, containing a large number of photons that are distributed over energy levels Erhv , where h is the Planck constant and V its frequency. Also, the number of possible sites inside the box, which is characterized 41 by a frequency limited between v and v+dv is: d g=2V x- ***o?dv. 1- Calculate the number of photons of frequency limited between v and v+dv. 2- Calculate the energy dU then deduce its density du and its total energy density irradiated by the black body. 3- If you know that the power emitted from the block body in unit area, is written as: 9=u, Show 4 > that it can be written as Q=oT4 and that's by expressing o versus h, c and kb. Define o and calculate it. 4- Using Wien's displacement law and consider that the sun as black body, calculate its surface temperature if it is known that the spectrum reaches its extremum at the yellow wavelength a=0.6um