Examplea planet of mass m and an angular momentum l moves in a circular orbit in a potentia vr) = -, where k is a constant if it is slightly perturbed radially.

EXampleA planet of mass m and an angular momentum L moves in a circular orbit in a potentia Vr) = -, where K is a constant if it is slightly perturbed radially. The angular frequency of radial K oscillation is (CSIR NET June 2013)