A 21.0 -long wire with a linear density of 30.0 passes across the open end of an 82.0 -long open-closed tube of air. If the wire, which is fixed at both ends, vibrates at its fundamental frequency, the sound wave it generates excites the second vibrational mode of the tube of air. What is the tension in the wire? Assume the velocity of sound is 340 m/s.