The oxygen (O2) molecule is composed of two oxygen atoms, each with mass of 2.7 × 10-26 kg and a center-to-center separation 1.24 × 10-10 m. For this molecule, find
(a) the rotational inertia I about the perpendicular bisector of the line joining the two atoms,
(b) the energy of the first excited (l = 1) rotational state,
(c) the rotational excitation temperature.