text: a questions about waves? a cord of length 1.5 m is fixed at both ends. its mass per unit length is 1.2 g/m and the tension is 12 n.   what is the frequency of the fundamental oscillation? fundamental oscillation should have wavelength equal to twice the length of chord = 3 m  velocity of wave on string = sqrt (t/m(kg/m)                                              =sqrt (12/0.0012)                                              =sqrt (10000) = 100 m/s  frequency = velocity / wavelength = 100 / 3                                                         =  33.3 hz