Calculating String Tension: Mass, Length, and Frequency

[benjicolon]

Homework Statement

What is the tension of the string?

Mass of piano string- 3.5g
Lenght of piano string- 75cm
Fundamental frecuency- 469Hz

Homework Equations

λ=2L/n ?

Dont know where to start.

 

[hilbert2]

This page should help: http://hyperphysics.phy-astr.gsu.edu/hbase/waves/string.html .