The portion of a cello string between the bridge and upper end of the finger board $($that part of the string that is free to vibrate$)$ is of length $60\mathrm{.}0$ cmcm$,$ and this length of the string has mass $2\mathrm{.}03$ gg$.$ The string sounds an A$4$A$4$ note $(440$ HzHz$)$ when played.$\text{'}$