Question

Suppose that the wavenumber of the J = 1 ← 0 rotational transition of 1H79Br considered as a rigid rotor was measured to be 17.89 cm-1, what is
(a) the moment of inertia of the molecule? ______ kg-m2
(b) the bond length?  ______ Angstroms
(Given the isotopic masses:(m(79Br) = 78.9183 amu, m(81Br) = 80.9163 amu)

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