One string of a certain musical instrument is 80.0cm long and has a mass of 8.72 g. It is being played in a room where the speed of sound is 344m/s To what tension must you adjust the string so that, when vibrating in its second overtone, it produces sound of wavelength 0.768m ? (Assume that the breaking stress of the wire is very large and isn't exceeded.). What frequency sound does this string produce in its fundamental mode of vibration?