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Here we present the two-photon and two-gluon decay widths of the S-wave($\eta_{Q\in c,b}$) and P-wave ($\chi_{Q\in c,bJ}$) charmonium and bottoniumstates and the radiative transition decay widths of $c\bar c$, $b\bar b$ and$c\bar b$ systems based on Coulomb plus power form of the inter-quark potential($CPP_\nu$) with exponent $\nu$. The Schr$\ddot{o}$dinger equation is solvednumerically for different choices of the exponent $\nu$. We employ the massesof different states and their radial wave functions obtained from the study tocompute the two-photon and two-gluon decay widths and the E1 and M1 radiativetransitions. It is found that the quarkonia mass spectra and the E1 transitioncan be described by the same interquark model potential of the $CPP_\nu$ with$\nu=1.0$ for $c\bar c$ and $\nu=0.7$ for $b\bar b$ systems, while the M1transition (at which the spin of the system changes) and the decay rates in theannihilation channel of quarkonia are better estimated by a shallow potentialwith $\nu<1.0$.

Two-Photon, Two-gluon and Radiative Decays of Heavy Flavoured Mesons