Two point-like objects of masses 20 gm and 20 gm are fixed at the two ends of a rigid massless rod of length 20 cm. This system is suspended vertically from a rigid ceiling using a thin wire attached to its center of mass, as shown in the figure. The resulting torsional pendulum undergoes small oscillations. The torsional constant of the wire is  $1.6\times {10}^{-7}Nmra{d}^{-1}$. The angular frequency of the oscillations is  $n\times {10}^{-2}rad{s}^{-1}$. The value of n is _____