  Determination of the wave-function is very essential in the calculation of
static and dynamic properties like masses,decay constants of pseudo-scalar
mesons and masses of vector mesons.We use Dalgarno's perturbation theory and
Variation-ally Improved Perturbation Theory (VIPT) to solve Schrodinger
equation in a QCD inspired potential model wuth Cornell potential,which
consists linear and coulomb potential.We use both the options like Columbic
parent firstly and then linear parent while using the VIPT method. Comparison
of both these methods and also with experimental results are done in the
calculation of masses and decay constants.
