When a NaF molecule makes a transition from the 1 = 3 to the I = 2 rotational level with no change in vibrational quantum number or electronic state, a photon with wavelength 3.83mm is emitted. A sodium atom has mass 3.82 x 10-26 kg, and a fluorine atom has mass 3.15 x 10-26 kg. Calculate the equilibrium separation between the nuclei in a NaF molecule. How does your answer compare with the value for NaC1 given in Section 42.1? Is this result reasonable? Explain.