Force constant — UPSC CSE 1996 Physics PYQ

Calculate the bond length and force constant of the bond of {}^{12}\text{C}\ {}^{16}\text{O} molecule; given 0 \rightarrow 1 rotational line in v = 0 state is at 115.3\text{ GHz} and the wavelength of the vibrational frequency is 14.7\ \mu\text{m}.