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how do you calculate the tension in a wire given frequency, length and mass?

Sorry for the long title, i need to figure out why a different wire is used for the e-string of a violin as apposed to the wire used for a g-string. I know it has to do with the frequency of the fundamental being to great and thus exceeding the breaking point of the wire, but i cannot for life of me rember the equation for the tension of a wire, given its length, mass per unit lenght and the frequency.

Can any one give me the formula and then i'll be able to do it, as i need to provide numerical proof to get the mark.
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.:Emmy:.
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woo figured it out. the mass per unit lenght must be ,much lower!! yay more marks for my labs!!

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