a third harmonic of a 50g guitar string oscillates at a frequency of 1280hz. the wavelength is 30cm determine the tension in the string and the string length. my attempt: the 3rd harmonic of a guitar string is 3/2 times the wavelength so the length of the string is 45cm. so mass per unit length is .05/.45=.111kg/m v=f(lambda) so v =384ms^1 V=sqrt(T/mu) so 384=sqrt(T/.111) T therefore is =16367.616N isnt this value for tension too large to be correct? where am i going wrong?