Effects of photo-excitation and spin wave scattering on magnetism of the dilutedrnmagnetic semiconductor (DMS) (Ga,Mn)As is theoretically studied. The exchangerncoupling energy between Mn+2 spins local moments is computed starting with thernzeeman energy. Its equivalence with the Rudermann-Kittel-Kasuya-Yosida (RKKY)rnexchange energy which is known to have an oscillatory characteristics and contributingrnto an indirect exchange, expressed based on the Zener model is described. Thisrnenergy is shown to rise to maximum near/at resonance. Green function formalismrnis used to find expression for ferromagnetic transition temperature TC, magnetizationrnand magnetic specific heat Cmag starting with a model Hamiltonian consistingrnof magnons, photons and an interaction of magnons with photons. TC is indicatedrnfor zero impurity concentration, x = 0. Unusual upturn in magnetization and negativernmagnon specific heat are observed at very low temperature values for largerrnmagnon-photon coupling constant Â®, in which an increase in this coupling is foundrnto decrease Cmag, and enhance the magnetization and the ferromagnetic ordering.rnThere is no observed effect of spin wave scattering on Cmag at lower temperaturesrnwhich, however, is found to rise faster exceeding scattering absence as temperaturernincreases. Exchange coupling energy Jnm, magnetizationM(T)=M(0), ferromagneticrntransition temperature TC and magnon specific heat capacity Cmag are plotted andrncompared with available experimental observations