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**A violinist places her finger so that the vibrating section of her 1.0 g/m string has a length of 30 cm, then she draws her bow across it. A listener nearby in a 20 degrees C room hears a note with a wavelength of 40 cm. What is the tension in the string?**

I have been messing around with a couple different equations. The one I am pretty sure I need to use is:

Fund. Freq. = v/2L = 1/2L * [tex]\sqrt{T_{s}/linear density}[/tex]

So I figured if I could somehow get v (speed of the wave on the string) or the fundamental frequency, I could solve for the tension of the string. This is where the problem is I have no idea how to do that, because as far as i know the speed of a wave on a string depends on the Tension of the string, which brings us back to what we need in the first place...

Any advice at all would be appreciated because I am really stumped.

Thanks!