39. hamiltonian of a spin system is given by h-o. b, a>0, where b denotes the external magnetic field. the energy eigen values are (a) -a b fb, +b,) (b) ab, t

1 39. Hamiltonian of a spin system is given by H-o. B, a>0, where B denotes the external magnetic field. The energy eigen values are (A) -a B FB, +B,) (B) aB, tiB,) (c) aB (D) ta B,