Hi, could I get some help with this micro-macro connection physics problem involving the rotational frequency of a molecule?

The set up is:

Treating the diatomic oxygen molecule O₂ as a perfect dumbbell with length 0.12 nm between the molecules, what is the rotational frequency of the molecule in gigahertz (GHz) at a cold temperature of 100 kelvin (K) to 4 digits of precision if k_B = 1.38e-23 J/K and the mass of O₂ is 16 u, where the atomic mass unit u = 1.66e-27 kg?

Thank you.