One string of a certain musical instrument is 72.0 cm long and has a mass of 8.76 g . It is being played in a room where the speed of sound is 344 m/s . a) To what tension must you adjust the string so that, when vibrating in its second overtone, it produces sound of wavelength 0.757 m ? (Assume that the breaking stress of the wire is very large and isn’t exceeded.) b)What frequency sound does this string produce in its fundamental mode of vibration?