I was given this problem, but I dont know where to start? R(v) = dE/dv = (8(pie)(h)(v^3)/ (c^3(e^(hv/kT-1))). Recall that if you want the energy per unit wavelength, you cannot simply replace the argument v with c/wavelength. Instead you must write R(wavelength) = dE/dv = (dE/dv)(dv/d wavelength). Evaluate R(). Any help is appreciated!!