Which one of the following choices is the correct expectation value > of the operator defined by = (1/2) kfx2 for a particle described by the normalized wavefunction (x)=(2c)1/2exp(cx) where (0x),kf is the force constant and c is a real, positive constant. kc2 k(4c)2 kc (and the sunshine band) k(1/c) k(2c)1 k(2c)2