The third and fifth lines in vibrational rotation spectrum of CO are separated by 10cm-1. The CO bond length is given by
1
\(\sqrt{\frac{h}{10\pi^2\mu c}}\)
2
\(\sqrt{\frac{h}{20\pi^2\mu c}}\)
3
\(\sqrt{\frac{5h}{32\pi^2\mu c}}\)
4
\(\sqrt{\frac{5h}{16\pi^2\mu c}}\)