Halliday, Resnick & Walker — Waves–I: Problem Problem_61

In an experiment on standing waves, a string \(90 \text{ cm}\) long is attached to the prong of an electrically driven tuning fork that oscillates perpendicular to the length of the string at a frequency of \(60 \text{ Hz}\). The mass of the string is \(0.044 \text{ kg}\). What tension must the string be under (weights are attached to the other end) if it is to oscillate in four loops?