where ρ ρ v d ν ν would be the average energy of the volume in contact with the thermal bath. The above expression has two terms, the second corresponding to the classical Rayleigh-Jeans law (i.e. a wavelike term), and the first corresponding to the Wien distribution law (which from Einstein's 1905 analysis, would result from point-like quanta with energy h ν ν ). From this, Einstein concluded that radiation had simultaneous wave and particle aspects.