What is the wave speed in a brass wire

[Batman354]

Homework Statement

What is the wave speed in a brass wire with a radius of 4.65×10-4 m stretched with a tension of 128 N? The density of brass is 8.60×103 kg/m^3.

Homework Equations

v=square root of T/u

The Attempt at a Solution

I have already found the cross sectional area but am unsure of what to do from there.

 

[rl.bhat]

Hi Batman345, welcome to PF.
Mass per unit length μ =Density*Area