Planck's law of radiation?? Hi, can anybody help me with this problem? Planck's law of radiation for a blackbody radiator quantifies the relation between it's radiative flux and wavelength at a particular temperature. given by: F(w)=C1/[w^5(exp(C2/wT)-1] where, w=wavelength, C1 and C2 are constants and T is the absolute temperature. My problem is , I have to show that the peak radiative flux of the Planck spectrum varies as the fourth power of temperature. Do i need to do some integration of Plancks law to show this? If so, where do i start?