Consider a guitar string which is under a tension of 149 N, has a length of 65.4 cm, and a mass per unit length of 3.45 103 kg/m. (a) What is the frequency of the fundamental mode of vibration? (b) In theory, what is the number of the highest harmonic that can be heard by a person capable of hearing frequencies up to 17,000 Hz? (In reality, you would never hear this because the amplitude of higher harmonics, even those with numbers around 10, makes them virtually impossible to hear.) litude in 7.85