The unperturbed wave functions of a particle trapped in an infinite square well of bottom 'a are v sin . if the system is perturbed by raising a the floor of th

The unperturbed wave functions of a particle trapped in an infinite square well of bottom 'a are V sin . If the system is perturbed by raising a the floor of the well by a constant amount Vo. then the second order correction to the energy of the nth state is: (A) nVo (B) Vo : C) zero (D) V