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We have studied the temperature dependence of the rate of energy transferfrom electronic sub-system to phononic sub-system in the case of cuprates, whenthe system is photo-excited by a femtosecond laser pulse. In the pseudogapstate, taking the electronic dispersion {\it as linear} near the nodal pointsof the Brillouin zone, we show that the rate of energy transfer from electronicsub-system to phononic sub-system is proportional to $T^{5}$ at lowertemperatures ($T<<T_0$), and is proportional to $T$ at higher temperatures($T>>T_0$), here $T_0$ is the Debye temperature for cuprates. The linearelectronic dispersion in the pseudogap state introduces new terms in theexpression of energy transfer as given by M. I. KAGANOV et.al. \cite{kaganov}.{\it But the leading terms are the same which are found in the case of metalsin the above reference.} The electron-phonon relaxation time follows $T^{-3}$law for cuprates which agrees well with the experimental results\cite{demsar,Jdemsar}.

Theory of the electron phonon relaxation time in cuprates: Reproducing the observed temperature behaviour