The steel wire of length \(0.9 \mathrm{~m}\) and cross-sectional area of \(1.3 \mathrm{~mm}\) is fixed at both ends in a musical instrument. The tension in the string is \(220 \mathrm{~N}\). A musician plucks the string while adjusting the lengths of the strings in the following sequence: \(0.5,0.7\), and \(0.9 \mathrm{~m}\). Compute the sequence of the fundamental frequencies of the sound generated by the instrument.