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## Homework Statement

using first-order perturbation theory ,estimate the correction to the ground state energy of a hydrogenic atom due to the finite size of the nucleus, assume it's spherical nucleus.

## Homework Equations

you can employ the fact that the electrostatic potential fi

fi=Ze/R(3/2-r^/2R^ ,if r<R

=Ze/r ,if r>R

fi is elctrostatic potential

R is radius, chargeZe