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A violinist places her finger so that the vibrating section of a 1.30 g/m string has...

A violinist places her finger so that the vibrating section of a 1.30 g/m string has a length of 40.0 cm, then she draws her bow across it. A listener nearby in a 20∘C room hears a note with a wavelength of 30.0 cm. What is the tension in the string?
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